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<h1 style="box-sizing: border-box; outline: 0px; margin: 8px 0px 16px; padding: 0px; font-family: &quot;PingFang SC&quot;, &quot;Microsoft YaHei&quot;, SimHei, Arial, SimSun; font-size: 28px; color: rgb(79, 79, 79); line-height: 36px; overflow-wrap: break-word; white-space: normal; background-color: rgb(255, 255, 255);">一、什么是位图</h1><p style="text-align:left;box-sizing: border-box; outline: 0px; margin-top: 0px; margin-bottom: 16px; padding: 0px; color: rgb(77, 77, 77); overflow: auto hidden; overflow-wrap: break-word; font-family: -apple-system, &quot;SF UI Text&quot;, Arial, &quot;PingFang SC&quot;, &quot;Hiragino Sans GB&quot;, &quot;Microsoft YaHei&quot;, &quot;WenQuanYi Micro Hei&quot;, sans-serif, SimHei, SimSun; white-space: normal; background-color: rgb(255, 255, 255); line-height: 26px !important;">计算机能以位图和矢量图格式显示图像。<h2 style="box-sizing: border-box; outline: 0px; margin: 8px 0px 16px; padding: 0px; font-family: &quot;PingFang SC&quot;, &quot;Microsoft YaHei&quot;, SimHei, Arial, SimSun; font-size: 24px; color: rgb(79, 79, 79); line-height: 32px; overflow-wrap: break-word; white-space: normal; background-color: rgb(255, 255, 255);"><a style="box-sizing: border-box; outline: none; margin: 0px; padding: 0px; font-weight: normal; cursor: pointer; color: rgb(78, 161, 219); overflow-wrap: break-word;" name="t1"></a><a style="box-sizing: border-box; outline: none; margin: 0px; padding: 0px; font-weight: normal; cursor: pointer; color: rgb(78, 161, 219); overflow-wrap: break-word;" name="t1"></a>1、位图(Bitmap)：</h2><p style="text-align:left;box-sizing: border-box; outline: 0px; margin-top: 0px; margin-bottom: 16px; padding: 0px; color: rgb(77, 77, 77); overflow: auto hidden; overflow-wrap: break-word; font-family: -apple-system, &quot;SF UI Text&quot;, Arial, &quot;PingFang SC&quot;, &quot;Hiragino Sans GB&quot;, &quot;Microsoft YaHei&quot;, &quot;WenQuanYi Micro Hei&quot;, sans-serif, SimHei, SimSun; white-space: normal; background-color: rgb(255, 255, 255); line-height: 26px !important;">图像又称点阵图或光栅图，它使用我们称为像素(象素，Pixel)的一格一格的小点来描述图像。计算机屏幕其实就是一张包含大量像素点的网格。当我们把位图放大时，每一个像素小点看上去就像是一个个马赛克色块。<h2 style="box-sizing: border-box; outline: 0px; margin: 8px 0px 16px; padding: 0px; font-family: &quot;PingFang SC&quot;, &quot;Microsoft YaHei&quot;, SimHei, Arial, SimSun; font-size: 24px; color: rgb(79, 79, 79); line-height: 32px; overflow-wrap: break-word; white-space: normal; background-color: rgb(255, 255, 255);"><a style="box-sizing: border-box; outline: none; margin: 0px; padding: 0px; font-weight: normal; cursor: pointer; color: rgb(78, 161, 219); overflow-wrap: break-word;" name="t2"></a><a style="box-sizing: border-box; outline: none; margin: 0px; padding: 0px; font-weight: normal; cursor: pointer; color: rgb(78, 161, 219); overflow-wrap: break-word;" name="t2"></a>2、矢量图(Vector)</h2><p style="text-align:left;box-sizing: border-box; outline: 0px; margin-top: 0px; margin-bottom: 16px; padding: 0px; color: rgb(77, 77, 77); overflow: auto hidden; overflow-wrap: break-word; font-family: -apple-system, &quot;SF UI Text&quot;, Arial, &quot;PingFang SC&quot;, &quot;Hiragino Sans GB&quot;, &quot;Microsoft YaHei&quot;, &quot;WenQuanYi Micro Hei&quot;, sans-serif, SimHei, SimSun; white-space: normal; background-color: rgb(255, 255, 255); line-height: 26px !important;">使用直线和曲线来描述图形，这些图形的元素是一些点、线、矩形、多边形、圆和弧线等等，它们都是通过数学公式计算获得的。<p style="text-align:left;box-sizing: border-box; outline: 0px; margin-top: 0px; margin-bottom: 16px; padding: 0px; color: rgb(77, 77, 77); overflow: auto hidden; overflow-wrap: break-word; font-family: -apple-system, &quot;SF UI Text&quot;, Arial, &quot;PingFang SC&quot;, &quot;Hiragino Sans GB&quot;, &quot;Microsoft YaHei&quot;, &quot;WenQuanYi Micro Hei&quot;, sans-serif, SimHei, SimSun; white-space: normal; background-color: rgb(255, 255, 255); line-height: 26px !important;">位图和矢量图最简单的区别就是：矢量图可以无限放大，而且不会失真；而位图则不能。<p style="text-align:left;box-sizing: border-box; outline: 0px; margin-top: 0px; margin-bottom: 16px; padding: 0px; color: rgb(77, 77, 77); overflow: auto hidden; overflow-wrap: break-word; font-family: -apple-system, &quot;SF UI Text&quot;, Arial, &quot;PingFang SC&quot;, &quot;Hiragino Sans GB&quot;, &quot;Microsoft YaHei&quot;, &quot;WenQuanYi Micro Hei&quot;, sans-serif, SimHei, SimSun; white-space: normal; background-color: rgb(255, 255, 255); line-height: 26px !important;">像Photoshop(PS)这样主要用于处理位图的软件，我们称之为图像处理软件；专门处理矢量图的软件，我们称之为图形设计软件，例如Adobe Illustrator，CorelDRAW，Flash MX等。<h1 style="box-sizing: border-box; outline: 0px; margin: 8px 0px 16px; padding: 0px; font-family: &quot;PingFang SC&quot;, &quot;Microsoft YaHei&quot;, SimHei, Arial, SimSun; font-size: 28px; color: rgb(79, 79, 79); line-height: 36px; overflow-wrap: break-word; white-space: normal; background-color: rgb(255, 255, 255);"><a style="box-sizing: border-box; outline: none; margin: 0px; padding: 0px; font-weight: normal; cursor: pointer; color: rgb(78, 161, 219); overflow-wrap: break-word;" name="t3"></a><a style="box-sizing: border-box; outline: none; margin: 0px; padding: 0px; font-weight: normal; cursor: pointer; color: rgb(78, 161, 219); overflow-wrap: break-word;" name="t3"></a>二、BMP位图文件</h1><p style="text-align:left;box-sizing: border-box; outline: 0px; margin-top: 0px; margin-bottom: 16px; padding: 0px; color: rgb(77, 77, 77); overflow: auto hidden; overflow-wrap: break-word; font-family: -apple-system, &quot;SF UI Text&quot;, Arial, &quot;PingFang SC&quot;, &quot;Hiragino Sans GB&quot;, &quot;Microsoft YaHei&quot;, &quot;WenQuanYi Micro Hei&quot;, sans-serif, SimHei, SimSun; white-space: normal; background-color: rgb(255, 255, 255); line-height: 26px !important;">常见的图像文件格式有：BMP、JPG(JPE,JPEG)、GIF等。<p style="box-sizing: border-box; outline: 0px; margin-top: 0px; margin-bottom: 16px; padding: 0px; color: rgb(77, 77, 77); overflow: auto hidden; overflow-wrap: break-word; font-family: -apple-system, &quot;SF UI Text&quot;, Arial, &quot;PingFang SC&quot;, &quot;Hiragino Sans GB&quot;, &quot;Microsoft YaHei&quot;, &quot;WenQuanYi Micro Hei&quot;, sans-serif, SimHei, SimSun; white-space: normal; background-color: rgb(255, 255, 255); line-height: 26px !important;">BMP图像文件(Bitmap-File)格式是Windows采用的图像文件存储格式，在Windows环境下运行的所有图像处理软件都支持这种格式。Windows 3.0以后的BMP文件都是指设备无关位图(DIB，device-independent bitmap)。BMP位图文件默认的文件扩展名是.BMP，有时它也会以.DIB或.RLE作扩展名。<p style="box-sizing: border-box; outline: 0px; margin-top: 0px; margin-bottom: 16px; padding: 0px; color: rgb(77, 77, 77); overflow: auto hidden; overflow-wrap: break-word; font-family: -apple-system, &quot;SF UI Text&quot;, Arial, &quot;PingFang SC&quot;, &quot;Hiragino Sans GB&quot;, &quot;Microsoft YaHei&quot;, &quot;WenQuanYi Micro Hei&quot;, sans-serif, SimHei, SimSun; white-space: normal; background-color: rgb(255, 255, 255); line-height: 26px !important;">注：本文采用lena.bmp（512×512）做例子： <p style="box-sizing: border-box; outline: 0px; margin-top: 0px; margin-bottom: 16px; padding: 0px; color: rgb(77, 77, 77); overflow: auto hidden; overflow-wrap: break-word; font-family: -apple-system, &quot;SF UI Text&quot;, Arial, &quot;PingFang SC&quot;, &quot;Hiragino Sans GB&quot;, &quot;Microsoft YaHei&quot;, &quot;WenQuanYi Micro Hei&quot;, sans-serif, SimHei, SimSun; white-space: normal; background-color: rgb(255, 255, 255); line-height: 26px !important;"><img src="https://img-blog.csdn.net/20140514114029140" alt="" style="box-sizing: border-box; outline: none; border: 0px; max-width: 100%; height: auto; overflow-wrap: break-word; cursor: zoom-in;"/> <h2 style="box-sizing: border-box; outline: 0px; margin: 8px 0px 16px; padding: 0px; font-family: &quot;PingFang SC&quot;, &quot;Microsoft YaHei&quot;, SimHei, Arial, SimSun; font-size: 24px; color: rgb(79, 79, 79); line-height: 32px; overflow-wrap: break-word; white-space: normal; background-color: rgb(255, 255, 255);"><a style="box-sizing: border-box; outline: none; margin: 0px; padding: 0px; font-weight: normal; cursor: pointer; color: rgb(78, 161, 219); overflow-wrap: break-word;" name="t4"></a><a style="box-sizing: border-box; outline: none; margin: 0px; padding: 0px; font-weight: normal; cursor: pointer; color: rgb(78, 161, 219); overflow-wrap: break-word;" name="t4"></a>1、BMP文件结构</h2><p style="text-align:left;box-sizing: border-box; outline: 0px; margin-top: 0px; margin-bottom: 16px; padding: 0px; color: rgb(77, 77, 77); overflow: auto hidden; overflow-wrap: break-word; font-family: -apple-system, &quot;SF UI Text&quot;, Arial, &quot;PingFang SC&quot;, &quot;Hiragino Sans GB&quot;, &quot;Microsoft YaHei&quot;, &quot;WenQuanYi Micro Hei&quot;, sans-serif, SimHei, SimSun; white-space: normal; background-color: rgb(255, 255, 255); line-height: 26px !important;">BMP文件由4部分组成：<p style="text-align:left;box-sizing: border-box; outline: 0px; margin-top: 0px; margin-bottom: 16px; padding: 0px; color: rgb(77, 77, 77); overflow: auto hidden; overflow-wrap: break-word; font-family: -apple-system, &quot;SF UI Text&quot;, Arial, &quot;PingFang SC&quot;, &quot;Hiragino Sans GB&quot;, &quot;Microsoft YaHei&quot;, &quot;WenQuanYi Micro Hei&quot;, sans-serif, SimHei, SimSun; white-space: normal; background-color: rgb(255, 255, 255); line-height: 26px !important;">1.&nbsp;&nbsp; 位图文件头(bitmap-file header)<p style="text-align:left;box-sizing: border-box; outline: 0px; margin-top: 0px; margin-bottom: 16px; padding: 0px; color: rgb(77, 77, 77); overflow: auto hidden; overflow-wrap: break-word; font-family: -apple-system, &quot;SF UI Text&quot;, Arial, &quot;PingFang SC&quot;, &quot;Hiragino Sans GB&quot;, &quot;Microsoft YaHei&quot;, &quot;WenQuanYi Micro Hei&quot;, sans-serif, SimHei, SimSun; white-space: normal; background-color: rgb(255, 255, 255); line-height: 26px !important;">2.&nbsp;&nbsp; 位图信息头(bitmap-informationheader)<p style="text-align:left;box-sizing: border-box; outline: 0px; margin-top: 0px; margin-bottom: 16px; padding: 0px; color: rgb(77, 77, 77); overflow: auto hidden; overflow-wrap: break-word; font-family: -apple-system, &quot;SF UI Text&quot;, Arial, &quot;PingFang SC&quot;, &quot;Hiragino Sans GB&quot;, &quot;Microsoft YaHei&quot;, &quot;WenQuanYi Micro Hei&quot;, sans-serif, SimHei, SimSun; white-space: normal; background-color: rgb(255, 255, 255); line-height: 26px !important;">3.&nbsp;&nbsp; 颜色表(color table)<p style="text-align:left;box-sizing: border-box; outline: 0px; margin-top: 0px; margin-bottom: 16px; padding: 0px; color: rgb(77, 77, 77); overflow: auto hidden; overflow-wrap: break-word; font-family: -apple-system, &quot;SF UI Text&quot;, Arial, &quot;PingFang SC&quot;, &quot;Hiragino Sans GB&quot;, &quot;Microsoft YaHei&quot;, &quot;WenQuanYi Micro Hei&quot;, sans-serif, SimHei, SimSun; white-space: normal; background-color: rgb(255, 255, 255); line-height: 26px !important;">4.&nbsp;&nbsp; 颜色点阵数据(bits data)<p style="text-align:left;box-sizing: border-box; outline: 0px; margin-top: 0px; margin-bottom: 16px; padding: 0px; color: rgb(77, 77, 77); overflow: auto hidden; overflow-wrap: break-word; font-family: -apple-system, &quot;SF UI Text&quot;, Arial, &quot;PingFang SC&quot;, &quot;Hiragino Sans GB&quot;, &quot;Microsoft YaHei&quot;, &quot;WenQuanYi Micro Hei&quot;, sans-serif, SimHei, SimSun; white-space: normal; background-color: rgb(255, 255, 255); line-height: 26px !important;">24位真彩色位图没有颜色表，所以只有1、2、4这三部分。<p style="text-align:left;box-sizing: border-box; outline: 0px; margin-top: 0px; margin-bottom: 16px; padding: 0px; color: rgb(77, 77, 77); overflow: auto hidden; overflow-wrap: break-word; font-family: -apple-system, &quot;SF UI Text&quot;, Arial, &quot;PingFang SC&quot;, &quot;Hiragino Sans GB&quot;, &quot;Microsoft YaHei&quot;, &quot;WenQuanYi Micro Hei&quot;, sans-serif, SimHei, SimSun; white-space: normal; background-color: rgb(255, 255, 255); line-height: 26px !important;">用UltraEdit打开lena.bmp，可以看到这个文件的全部数据如下图所示：<p style="text-align:left;box-sizing: border-box; outline: 0px; margin-top: 0px; margin-bottom: 16px; padding: 0px; color: rgb(77, 77, 77); overflow: auto hidden; overflow-wrap: break-word; font-family: -apple-system, &quot;SF UI Text&quot;, Arial, &quot;PingFang SC&quot;, &quot;Hiragino Sans GB&quot;, &quot;Microsoft YaHei&quot;, &quot;WenQuanYi Micro Hei&quot;, sans-serif, SimHei, SimSun; white-space: normal; background-color: rgb(255, 255, 255); line-height: 26px !important;"><img src="https://img-blog.csdn.net/20140514113929359" alt="" style="box-sizing: border-box; outline: none; border: 0px; max-width: 100%; height: auto; overflow-wrap: break-word; cursor: zoom-in;"/> <p style="text-align:left;box-sizing: border-box; outline: 0px; margin-top: 0px; margin-bottom: 16px; padding: 0px; color: rgb(77, 77, 77); overflow: auto hidden; overflow-wrap: break-word; font-family: -apple-system, &quot;SF UI Text&quot;, Arial, &quot;PingFang SC&quot;, &quot;Hiragino Sans GB&quot;, &quot;Microsoft YaHei&quot;, &quot;WenQuanYi Micro Hei&quot;, sans-serif, SimHei, SimSun; white-space: normal; background-color: rgb(255, 255, 255); line-height: 26px !important;"> <h3 style="box-sizing: border-box; outline: 0px; margin: 8px 0px 16px; padding: 0px; font-family: &quot;PingFang SC&quot;, &quot;Microsoft YaHei&quot;, SimHei, Arial, SimSun; font-size: 22px; color: rgb(79, 79, 79); line-height: 30px; overflow-wrap: break-word; white-space: normal; background-color: rgb(255, 255, 255);"><a style="box-sizing: border-box; outline: none; margin: 0px; padding: 0px; font-weight: normal; cursor: pointer; color: rgb(78, 161, 219); overflow-wrap: break-word;" name="t5"></a><a style="box-sizing: border-box; outline: none; margin: 0px; padding: 0px; font-weight: normal; cursor: pointer; color: rgb(78, 161, 219); overflow-wrap: break-word;" name="t5"></a>1、1位图文件头</h3><p style="text-align:left;box-sizing: border-box; outline: 0px; margin-top: 0px; margin-bottom: 16px; padding: 0px; color: rgb(77, 77, 77); overflow: auto hidden; overflow-wrap: break-word; font-family: -apple-system, &quot;SF UI Text&quot;, Arial, &quot;PingFang SC&quot;, &quot;Hiragino Sans GB&quot;, &quot;Microsoft YaHei&quot;, &quot;WenQuanYi Micro Hei&quot;, sans-serif, SimHei, SimSun; white-space: normal; background-color: rgb(255, 255, 255); line-height: 26px !important;"> <p style="text-align:left;box-sizing: border-box; outline: 0px; margin-top: 0px; margin-bottom: 16px; padding: 0px; color: rgb(77, 77, 77); overflow: auto hidden; overflow-wrap: break-word; font-family: -apple-system, &quot;SF UI Text&quot;, Arial, &quot;PingFang SC&quot;, &quot;Hiragino Sans GB&quot;, &quot;Microsoft YaHei&quot;, &quot;WenQuanYi Micro Hei&quot;, sans-serif, SimHei, SimSun; white-space: normal; background-color: rgb(255, 255, 255); line-height: 26px !important;">位图文件头分4部分，共14字节：<table cellspacing="0" cellpadding="0" width="962"><thead style="box-sizing: border-box; outline: 0px; overflow-wrap: break-word;"><tr style="box-sizing: border-box; outline: 0px; border-width: 1px 0px 0px; border-right-style: initial; border-bottom-style: initial; border-left-style: initial; border-right-color: initial; border-bottom-color: initial; border-left-color: initial; border-image: initial; border-top-style: solid; border-top-color: rgb(221, 221, 221); overflow-wrap: break-word;" class="firstRow"><td style="box-sizing: border-box; outline: 0px; padding: 8px; margin: 0px; overflow-wrap: break-word; font-size: 14px; color: rgb(79, 79, 79); line-height: 22px;">名称</td><td style="box-sizing: border-box; outline: 0px; padding: 8px; margin: 0px; overflow-wrap: break-word; font-size: 14px; color: rgb(79, 79, 79); line-height: 22px;">占用空间</td><td style="box-sizing: border-box; outline: 0px; padding: 8px; margin: 0px; overflow-wrap: break-word; font-size: 14px; color: rgb(79, 79, 79); line-height: 22px;">内容</td><td style="box-sizing: border-box; outline: 0px; padding: 8px; margin: 0px; overflow-wrap: break-word; font-size: 14px; color: rgb(79, 79, 79); line-height: 22px;">实际数据</td></tr></thead><tbody style="box-sizing: border-box; outline: 0px; border: 0px; overflow-wrap: break-word;"><tr style="box-sizing: border-box; outline: 0px; border-width: 1px 0px 0px; border-right-style: initial; border-bottom-style: initial; border-left-style: initial; border-right-color: initial; border-bottom-color: initial; border-left-color: initial; border-image: initial; border-top-style: solid; border-top-color: rgb(221, 221, 221); overflow-wrap: break-word;"><td style="box-sizing: border-box; outline: 0px; padding: 8px; margin: 0px; overflow-wrap: break-word; font-size: 14px; color: rgb(79, 79, 79); line-height: 22px;">bfType</td><td style="box-sizing: border-box; outline: 0px; padding: 8px; margin: 0px; overflow-wrap: break-word; font-size: 14px; color: rgb(79, 79, 79); line-height: 22px;">2字节</td><td style="box-sizing: border-box; outline: 0px; padding: 8px; margin: 0px; overflow-wrap: break-word; font-size: 14px; color: rgb(79, 79, 79); line-height: 22px;">标识，就是“BM”二字</td><td style="box-sizing: border-box; outline: 0px; padding: 8px; margin: 0px; overflow-wrap: break-word; font-size: 14px; color: rgb(79, 79, 79); line-height: 22px;">BM</td></tr><tr style="box-sizing: border-box; outline: 0px; border-width: 1px 0px 0px; border-right-style: initial; border-bottom-style: initial; border-left-style: initial; border-right-color: initial; border-bottom-color: initial; border-left-color: initial; border-image: initial; border-top-style: solid; border-top-color: rgb(221, 221, 221); background-color: rgb(247, 247, 247); overflow-wrap: break-word;"><td style="box-sizing: border-box; outline: 0px; padding: 8px; margin: 0px; overflow-wrap: break-word; font-size: 14px; color: rgb(79, 79, 79); line-height: 22px;">bfSize</td><td style="box-sizing: border-box; outline: 0px; padding: 8px; margin: 0px; overflow-wrap: break-word; font-size: 14px; color: rgb(79, 79, 79); line-height: 22px;">4字节</td><td style="box-sizing: border-box; outline: 0px; padding: 8px; margin: 0px; overflow-wrap: break-word; font-size: 14px; color: rgb(79, 79, 79); line-height: 22px;">整个BMP文件的大小</td><td style="box-sizing: border-box; outline: 0px; padding: 8px; margin: 0px; overflow-wrap: break-word; font-size: 14px; color: rgb(79, 79, 79); line-height: 22px;">0x000C0036(786486)</td></tr><tr style="box-sizing: border-box; outline: 0px; border-width: 1px 0px 0px; border-right-style: initial; border-bottom-style: initial; border-left-style: initial; border-right-color: initial; border-bottom-color: initial; border-left-color: initial; border-image: initial; border-top-style: solid; border-top-color: rgb(221, 221, 221); overflow-wrap: break-word;"><td style="box-sizing: border-box; outline: 0px; padding: 8px; margin: 0px; overflow-wrap: break-word; font-size: 14px; color: rgb(79, 79, 79); line-height: 22px;">bfReserved1/2</td><td style="box-sizing: border-box; outline: 0px; padding: 8px; margin: 0px; overflow-wrap: break-word; font-size: 14px; color: rgb(79, 79, 79); line-height: 22px;">4字节</td><td style="box-sizing: border-box; outline: 0px; padding: 8px; margin: 0px; overflow-wrap: break-word; font-size: 14px; color: rgb(79, 79, 79); line-height: 22px;">保留字，没用</td><td style="box-sizing: border-box; outline: 0px; padding: 8px; margin: 0px; overflow-wrap: break-word; font-size: 14px; color: rgb(79, 79, 79); line-height: 22px;">0</td></tr><tr style="box-sizing: border-box; outline: 0px; border-width: 1px 0px 0px; border-right-style: initial; border-bottom-style: initial; border-left-style: initial; border-right-color: initial; border-bottom-color: initial; border-left-color: initial; border-image: initial; border-top-style: solid; border-top-color: rgb(221, 221, 221); background-color: rgb(247, 247, 247); overflow-wrap: break-word;"><td style="box-sizing: border-box; outline: 0px; padding: 8px; margin: 0px; overflow-wrap: break-word; font-size: 14px; color: rgb(79, 79, 79); line-height: 22px;">bfOffBits</td><td style="box-sizing: border-box; outline: 0px; padding: 8px; margin: 0px; overflow-wrap: break-word; font-size: 14px; color: rgb(79, 79, 79); line-height: 22px;">4字节</td><td style="box-sizing: border-box; outline: 0px; padding: 8px; margin: 0px; overflow-wrap: break-word; font-size: 14px; color: rgb(79, 79, 79); line-height: 22px;">偏移数，即 位图文件头+位图信息头+调色板 的大小</td><td style="box-sizing: border-box; outline: 0px; padding: 8px; margin: 0px; overflow-wrap: break-word; font-size: 14px; color: rgb(79, 79, 79); line-height: 22px;">0x36(54)</td></tr></tbody></table><p style="text-align:left;box-sizing: border-box; outline: 0px; margin-top: 0px; margin-bottom: 16px; padding: 0px; color: rgb(77, 77, 77); overflow: auto hidden; overflow-wrap: break-word; font-family: -apple-system, &quot;SF UI Text&quot;, Arial, &quot;PingFang SC&quot;, &quot;Hiragino Sans GB&quot;, &quot;Microsoft YaHei&quot;, &quot;WenQuanYi Micro Hei&quot;, sans-serif, SimHei, SimSun; white-space: normal; background-color: rgb(255, 255, 255); line-height: 26px !important;">注意，Windows的数据是倒着念的，这是PC电脑的特色。如果一段数据为50&nbsp;1A&nbsp;25 3C，倒着念就是3C 25 1A50，即0x3C251A50。因此，如果bfSize的数据为36 00 0C 00，实际上就成了0x000C0036，也就是0xC0036。<p style="text-align:left;box-sizing: border-box; outline: 0px; margin-top: 0px; margin-bottom: 16px; padding: 0px; color: rgb(77, 77, 77); overflow: auto hidden; overflow-wrap: break-word; font-family: -apple-system, &quot;SF UI Text&quot;, Arial, &quot;PingFang SC&quot;, &quot;Hiragino Sans GB&quot;, &quot;Microsoft YaHei&quot;, &quot;WenQuanYi Micro Hei&quot;, sans-serif, SimHei, SimSun; white-space: normal; background-color: rgb(255, 255, 255); line-height: 26px !important;"><img src="https://img-blog.csdn.net/20140514113957562" alt="" style="box-sizing: border-box; outline: none; border: 0px; max-width: 100%; height: auto; overflow-wrap: break-word; cursor: zoom-in;"/><p style="text-align:left;box-sizing: border-box; outline: 0px; margin-top: 0px; margin-bottom: 16px; padding: 0px; color: rgb(77, 77, 77); overflow: auto hidden; overflow-wrap: break-word; font-family: -apple-system, &quot;SF UI Text&quot;, Arial, &quot;PingFang SC&quot;, &quot;Hiragino Sans GB&quot;, &quot;Microsoft YaHei&quot;, &quot;WenQuanYi Micro Hei&quot;, sans-serif, SimHei, SimSun; white-space: normal; background-color: rgb(255, 255, 255); line-height: 26px !important;"> <h3 style="box-sizing: border-box; outline: 0px; margin: 8px 0px 16px; padding: 0px; font-family: &quot;PingFang SC&quot;, &quot;Microsoft YaHei&quot;, SimHei, Arial, SimSun; font-size: 22px; color: rgb(79, 79, 79); line-height: 30px; overflow-wrap: break-word; white-space: normal; background-color: rgb(255, 255, 255);"><a style="box-sizing: border-box; outline: none; margin: 0px; padding: 0px; font-weight: normal; cursor: pointer; color: rgb(78, 161, 219); overflow-wrap: break-word;" name="t6"></a><a style="box-sizing: border-box; outline: none; margin: 0px; padding: 0px; font-weight: normal; cursor: pointer; color: rgb(78, 161, 219); overflow-wrap: break-word;" name="t6"></a>1、2位图信息头</h3><p style="text-align:left;box-sizing: border-box; outline: 0px; margin-top: 0px; margin-bottom: 16px; padding: 0px; color: rgb(77, 77, 77); overflow: auto hidden; overflow-wrap: break-word; font-family: -apple-system, &quot;SF UI Text&quot;, Arial, &quot;PingFang SC&quot;, &quot;Hiragino Sans GB&quot;, &quot;Microsoft YaHei&quot;, &quot;WenQuanYi Micro Hei&quot;, sans-serif, SimHei, SimSun; white-space: normal; background-color: rgb(255, 255, 255); line-height: 26px !important;">位图信息头共40字节：<table cellspacing="0" cellpadding="0" width="962"><thead style="box-sizing: border-box; outline: 0px; overflow-wrap: break-word;"><tr style="box-sizing: border-box; outline: 0px; border-width: 1px 0px 0px; border-right-style: initial; border-bottom-style: initial; border-left-style: initial; border-right-color: initial; border-bottom-color: initial; border-left-color: initial; border-image: initial; border-top-style: solid; border-top-color: rgb(221, 221, 221); overflow-wrap: break-word;" class="firstRow"><td style="box-sizing: border-box; outline: 0px; padding: 8px; margin: 0px; overflow-wrap: break-word; font-size: 14px; color: rgb(79, 79, 79); line-height: 22px;">名称</td><td style="box-sizing: border-box; outline: 0px; padding: 8px; margin: 0px; overflow-wrap: break-word; font-size: 14px; color: rgb(79, 79, 79); line-height: 22px;">占用空间</td><td style="box-sizing: border-box; outline: 0px; padding: 8px; margin: 0px; overflow-wrap: break-word; font-size: 14px; color: rgb(79, 79, 79); line-height: 22px;">内容</td><td style="box-sizing: border-box; outline: 0px; padding: 8px; margin: 0px; overflow-wrap: break-word; font-size: 14px; color: rgb(79, 79, 79); line-height: 22px;">实际数据</td></tr></thead><tbody style="box-sizing: border-box; outline: 0px; border: 0px; overflow-wrap: break-word;"><tr style="box-sizing: border-box; outline: 0px; border-width: 1px 0px 0px; border-right-style: initial; border-bottom-style: initial; border-left-style: initial; border-right-color: initial; border-bottom-color: initial; border-left-color: initial; border-image: initial; border-top-style: solid; border-top-color: rgb(221, 221, 221); overflow-wrap: break-word;"><td style="box-sizing: border-box; outline: 0px; padding: 8px; margin: 0px; overflow-wrap: break-word; font-size: 14px; color: rgb(79, 79, 79); line-height: 22px;">biSize</td><td style="box-sizing: border-box; outline: 0px; padding: 8px; margin: 0px; overflow-wrap: break-word; font-size: 14px; color: rgb(79, 79, 79); line-height: 22px;">4字节</td><td style="box-sizing: border-box; outline: 0px; padding: 8px; margin: 0px; overflow-wrap: break-word; font-size: 14px; color: rgb(79, 79, 79); line-height: 22px;">位图信息头的大小，为40</td><td style="box-sizing: border-box; outline: 0px; padding: 8px; margin: 0px; overflow-wrap: break-word; font-size: 14px; color: rgb(79, 79, 79); line-height: 22px;">0x28(40)</td></tr><tr style="box-sizing: border-box; outline: 0px; border-width: 1px 0px 0px; border-right-style: initial; border-bottom-style: initial; border-left-style: initial; border-right-color: initial; border-bottom-color: initial; border-left-color: initial; border-image: initial; border-top-style: solid; border-top-color: rgb(221, 221, 221); background-color: rgb(247, 247, 247); overflow-wrap: break-word;"><td style="box-sizing: border-box; outline: 0px; padding: 8px; margin: 0px; overflow-wrap: break-word; font-size: 14px; color: rgb(79, 79, 79); line-height: 22px;">biWidth</td><td style="box-sizing: border-box; outline: 0px; padding: 8px; margin: 0px; overflow-wrap: break-word; font-size: 14px; color: rgb(79, 79, 79); line-height: 22px;">4字节</td><td style="box-sizing: border-box; outline: 0px; padding: 8px; margin: 0px; overflow-wrap: break-word; font-size: 14px; color: rgb(79, 79, 79); line-height: 22px;">位图的宽度，单位是像素</td><td style="box-sizing: border-box; outline: 0px; padding: 8px; margin: 0px; overflow-wrap: break-word; font-size: 14px; color: rgb(79, 79, 79); line-height: 22px;">0x200(512)</td></tr><tr style="box-sizing: border-box; outline: 0px; border-width: 1px 0px 0px; border-right-style: initial; border-bottom-style: initial; border-left-style: initial; border-right-color: initial; border-bottom-color: initial; border-left-color: initial; border-image: initial; border-top-style: solid; border-top-color: rgb(221, 221, 221); overflow-wrap: break-word;"><td style="box-sizing: border-box; outline: 0px; padding: 8px; margin: 0px; overflow-wrap: break-word; font-size: 14px; color: rgb(79, 79, 79); line-height: 22px;">biHeight</td><td style="box-sizing: border-box; outline: 0px; padding: 8px; margin: 0px; overflow-wrap: break-word; font-size: 14px; color: rgb(79, 79, 79); line-height: 22px;">4字节</td><td style="box-sizing: border-box; outline: 0px; padding: 8px; margin: 0px; overflow-wrap: break-word; font-size: 14px; color: rgb(79, 79, 79); line-height: 22px;">位图的高度，单位是像素</td><td style="box-sizing: border-box; outline: 0px; padding: 8px; margin: 0px; overflow-wrap: break-word; font-size: 14px; color: rgb(79, 79, 79); line-height: 22px;">0x200(512)</td></tr><tr style="box-sizing: border-box; outline: 0px; border-width: 1px 0px 0px; border-right-style: initial; border-bottom-style: initial; border-left-style: initial; border-right-color: initial; border-bottom-color: initial; border-left-color: initial; border-image: initial; border-top-style: solid; border-top-color: rgb(221, 221, 221); background-color: rgb(247, 247, 247); overflow-wrap: break-word;"><td style="box-sizing: border-box; outline: 0px; padding: 8px; margin: 0px; overflow-wrap: break-word; font-size: 14px; color: rgb(79, 79, 79); line-height: 22px;">biPlanes</td><td style="box-sizing: border-box; outline: 0px; padding: 8px; margin: 0px; overflow-wrap: break-word; font-size: 14px; color: rgb(79, 79, 79); line-height: 22px;">2字节</td><td style="box-sizing: border-box; outline: 0px; padding: 8px; margin: 0px; overflow-wrap: break-word; font-size: 14px; color: rgb(79, 79, 79); line-height: 22px;">固定值1</td><td style="box-sizing: border-box; outline: 0px; padding: 8px; margin: 0px; overflow-wrap: break-word; font-size: 14px; color: rgb(79, 79, 79); line-height: 22px;">1</td></tr><tr style="box-sizing: border-box; outline: 0px; border-width: 1px 0px 0px; border-right-style: initial; border-bottom-style: initial; border-left-style: initial; border-right-color: initial; border-bottom-color: initial; border-left-color: initial; border-image: initial; border-top-style: solid; border-top-color: rgb(221, 221, 221); overflow-wrap: break-word;"><td style="box-sizing: border-box; outline: 0px; padding: 8px; margin: 0px; overflow-wrap: break-word; font-size: 14px; color: rgb(79, 79, 79); line-height: 22px;">biBitCount</td><td style="box-sizing: border-box; outline: 0px; padding: 8px; margin: 0px; overflow-wrap: break-word; font-size: 14px; color: rgb(79, 79, 79); line-height: 22px;">2字节</td><td style="box-sizing: border-box; outline: 0px; padding: 8px; margin: 0px; overflow-wrap: break-word; font-size: 14px; color: rgb(79, 79, 79); line-height: 22px;">每个像素的位数1-黑白图，4-16色，8-256色，24-真彩色</td><td style="box-sizing: border-box; outline: 0px; padding: 8px; margin: 0px; overflow-wrap: break-word; font-size: 14px; color: rgb(79, 79, 79); line-height: 22px;">0x18(24)</td></tr><tr style="box-sizing: border-box; outline: 0px; border-width: 1px 0px 0px; border-right-style: initial; border-bottom-style: initial; border-left-style: initial; border-right-color: initial; border-bottom-color: initial; border-left-color: initial; border-image: initial; border-top-style: solid; border-top-color: rgb(221, 221, 221); background-color: rgb(247, 247, 247); overflow-wrap: break-word;"><td style="box-sizing: border-box; outline: 0px; padding: 8px; margin: 0px; overflow-wrap: break-word; font-size: 14px; color: rgb(79, 79, 79); line-height: 22px;">biCompression</td><td style="box-sizing: border-box; outline: 0px; padding: 8px; margin: 0px; overflow-wrap: break-word; font-size: 14px; color: rgb(79, 79, 79); line-height: 22px;">4字节</td><td style="box-sizing: border-box; outline: 0px; padding: 8px; margin: 0px; overflow-wrap: break-word; font-size: 14px; color: rgb(79, 79, 79); line-height: 22px;">压缩方式，BI_RGB(0)为不压缩</td><td style="box-sizing: border-box; outline: 0px; padding: 8px; margin: 0px; overflow-wrap: break-word; font-size: 14px; color: rgb(79, 79, 79); line-height: 22px;">0</td></tr><tr style="box-sizing: border-box; outline: 0px; border-width: 1px 0px 0px; border-right-style: initial; border-bottom-style: initial; border-left-style: initial; border-right-color: initial; border-bottom-color: initial; border-left-color: initial; border-image: initial; border-top-style: solid; border-top-color: rgb(221, 221, 221); overflow-wrap: break-word;"><td style="box-sizing: border-box; outline: 0px; padding: 8px; margin: 0px; overflow-wrap: break-word; font-size: 14px; color: rgb(79, 79, 79); line-height: 22px;">biSizeImage</td><td style="box-sizing: border-box; outline: 0px; padding: 8px; margin: 0px; overflow-wrap: break-word; font-size: 14px; color: rgb(79, 79, 79); line-height: 22px;">4字节</td><td style="box-sizing: border-box; outline: 0px; padding: 8px; margin: 0px; overflow-wrap: break-word; font-size: 14px; color: rgb(79, 79, 79); line-height: 22px;">位图全部像素占用的字节数，BI_RGB时可设为0</td><td style="box-sizing: border-box; outline: 0px; padding: 8px; margin: 0px; overflow-wrap: break-word; font-size: 14px; color: rgb(79, 79, 79); line-height: 22px;">0x0C</td></tr><tr style="box-sizing: border-box; outline: 0px; border-width: 1px 0px 0px; border-right-style: initial; border-bottom-style: initial; border-left-style: initial; border-right-color: initial; border-bottom-color: initial; border-left-color: initial; border-image: initial; border-top-style: solid; border-top-color: rgb(221, 221, 221); background-color: rgb(247, 247, 247); overflow-wrap: break-word;"><td style="box-sizing: border-box; outline: 0px; padding: 8px; margin: 0px; overflow-wrap: break-word; font-size: 14px; color: rgb(79, 79, 79); line-height: 22px;">biXPelsPerMeter</td><td style="box-sizing: border-box; outline: 0px; padding: 8px; margin: 0px; overflow-wrap: break-word; font-size: 14px; color: rgb(79, 79, 79); line-height: 22px;">4字节</td><td style="box-sizing: border-box; outline: 0px; padding: 8px; margin: 0px; overflow-wrap: break-word; font-size: 14px; color: rgb(79, 79, 79); line-height: 22px;">水平分辨率(像素/米)</td><td style="box-sizing: border-box; outline: 0px; padding: 8px; margin: 0px; overflow-wrap: break-word; font-size: 14px; color: rgb(79, 79, 79); line-height: 22px;">0</td></tr><tr style="box-sizing: border-box; outline: 0px; border-width: 1px 0px 0px; border-right-style: initial; border-bottom-style: initial; border-left-style: initial; border-right-color: initial; border-bottom-color: initial; border-left-color: initial; border-image: initial; border-top-style: solid; border-top-color: rgb(221, 221, 221); overflow-wrap: break-word;"><td style="box-sizing: border-box; outline: 0px; padding: 8px; margin: 0px; overflow-wrap: break-word; font-size: 14px; color: rgb(79, 79, 79); line-height: 22px;">biYPelsPerMeter</td><td style="box-sizing: border-box; outline: 0px; padding: 8px; margin: 0px; overflow-wrap: break-word; font-size: 14px; color: rgb(79, 79, 79); line-height: 22px;">4字节</td><td style="box-sizing: border-box; outline: 0px; padding: 8px; margin: 0px; overflow-wrap: break-word; font-size: 14px; color: rgb(79, 79, 79); line-height: 22px;">垂直分辨率(像素/米)</td><td style="box-sizing: border-box; outline: 0px; padding: 8px; margin: 0px; overflow-wrap: break-word; font-size: 14px; color: rgb(79, 79, 79); line-height: 22px;">0</td></tr><tr style="box-sizing: border-box; outline: 0px; border-width: 1px 0px 0px; border-right-style: initial; border-bottom-style: initial; border-left-style: initial; border-right-color: initial; border-bottom-color: initial; border-left-color: initial; border-image: initial; border-top-style: solid; border-top-color: rgb(221, 221, 221); background-color: rgb(247, 247, 247); overflow-wrap: break-word;"><td style="box-sizing: border-box; outline: 0px; padding: 8px; margin: 0px; overflow-wrap: break-word; font-size: 14px; color: rgb(79, 79, 79); line-height: 22px;">biClrUsed</td><td style="box-sizing: border-box; outline: 0px; padding: 8px; margin: 0px; overflow-wrap: break-word; font-size: 14px; color: rgb(79, 79, 79); line-height: 22px;">4字节</td><td style="box-sizing: border-box; outline: 0px; padding: 8px; margin: 0px; overflow-wrap: break-word; font-size: 14px; color: rgb(79, 79, 79); line-height: 22px;">位图使用的颜色数如果为0，则颜色数为2的biBitCount次方</td><td style="box-sizing: border-box; outline: 0px; padding: 8px; margin: 0px; overflow-wrap: break-word; font-size: 14px; color: rgb(79, 79, 79); line-height: 22px;">0</td></tr><tr style="box-sizing: border-box; outline: 0px; border-width: 1px 0px 0px; border-right-style: initial; border-bottom-style: initial; border-left-style: initial; border-right-color: initial; border-bottom-color: initial; border-left-color: initial; border-image: initial; border-top-style: solid; border-top-color: rgb(221, 221, 221); overflow-wrap: break-word;"><td style="box-sizing: border-box; outline: 0px; padding: 8px; margin: 0px; overflow-wrap: break-word; font-size: 14px; color: rgb(79, 79, 79); line-height: 22px;">biClrImportant</td><td style="box-sizing: border-box; outline: 0px; padding: 8px; margin: 0px; overflow-wrap: break-word; font-size: 14px; color: rgb(79, 79, 79); line-height: 22px;">4字节</td><td style="box-sizing: border-box; outline: 0px; padding: 8px; margin: 0px; overflow-wrap: break-word; font-size: 14px; color: rgb(79, 79, 79); line-height: 22px;">重要的颜色数，0代表所有颜色都重要</td><td style="box-sizing: border-box; outline: 0px; padding: 8px; margin: 0px; overflow-wrap: break-word; font-size: 14px; color: rgb(79, 79, 79); line-height: 22px;">0</td></tr></tbody></table><p style="text-align:left;box-sizing: border-box; outline: 0px; margin-top: 0px; margin-bottom: 16px; padding: 0px; color: rgb(77, 77, 77); overflow: auto hidden; overflow-wrap: break-word; font-family: -apple-system, &quot;SF UI Text&quot;, Arial, &quot;PingFang SC&quot;, &quot;Hiragino Sans GB&quot;, &quot;Microsoft YaHei&quot;, &quot;WenQuanYi Micro Hei&quot;, sans-serif, SimHei, SimSun; white-space: normal; background-color: rgb(255, 255, 255); line-height: 26px !important;">作为真彩色位图，我们主要关心的是biWidth和biHeight这两个数值，两个数值告诉我们图像的尺寸。biSize，biPlanes，biBitCount这几个数值是固定的。想偷懒的话，其它的数值可以一律用0来填充。<p style="text-align:left;box-sizing: border-box; outline: 0px; margin-top: 0px; margin-bottom: 16px; padding: 0px; color: rgb(77, 77, 77); overflow: auto hidden; overflow-wrap: break-word; font-family: -apple-system, &quot;SF UI Text&quot;, Arial, &quot;PingFang SC&quot;, &quot;Hiragino Sans GB&quot;, &quot;Microsoft YaHei&quot;, &quot;WenQuanYi Micro Hei&quot;, sans-serif, SimHei, SimSun; white-space: normal; background-color: rgb(255, 255, 255); line-height: 26px !important;"> <p style="text-align:left;box-sizing: border-box; outline: 0px; margin-top: 0px; margin-bottom: 16px; padding: 0px; color: rgb(77, 77, 77); overflow: auto hidden; overflow-wrap: break-word; font-family: -apple-system, &quot;SF UI Text&quot;, Arial, &quot;PingFang SC&quot;, &quot;Hiragino Sans GB&quot;, &quot;Microsoft YaHei&quot;, &quot;WenQuanYi Micro Hei&quot;, sans-serif, SimHei, SimSun; white-space: normal; background-color: rgb(255, 255, 255); line-height: 26px !important;">&nbsp;<img src="https://img-blog.csdn.net/20140514114002625" alt="" style="box-sizing: border-box; outline: none; border: 0px; max-width: 100%; height: auto; overflow-wrap: break-word; cursor: zoom-in;"/><h3 style="box-sizing: border-box; outline: 0px; margin: 8px 0px 16px; padding: 0px; font-family: &quot;PingFang SC&quot;, &quot;Microsoft YaHei&quot;, SimHei, Arial, SimSun; font-size: 22px; color: rgb(79, 79, 79); line-height: 30px; overflow-wrap: break-word; white-space: normal; background-color: rgb(255, 255, 255);"><a style="box-sizing: border-box; outline: none; margin: 0px; padding: 0px; font-weight: normal; cursor: pointer; color: rgb(78, 161, 219); overflow-wrap: break-word;" name="t7"></a><a style="box-sizing: border-box; outline: none; margin: 0px; padding: 0px; font-weight: normal; cursor: pointer; color: rgb(78, 161, 219); overflow-wrap: break-word;" name="t7"></a>1、3颜色表</h3><p style="text-align:left;box-sizing: border-box; outline: 0px; margin-top: 0px; margin-bottom: 16px; padding: 0px; color: rgb(77, 77, 77); overflow: auto hidden; overflow-wrap: break-word; font-family: -apple-system, &quot;SF UI Text&quot;, Arial, &quot;PingFang SC&quot;, &quot;Hiragino Sans GB&quot;, &quot;Microsoft YaHei&quot;, &quot;WenQuanYi Micro Hei&quot;, sans-serif, SimHei, SimSun; white-space: normal; background-color: rgb(255, 255, 255); line-height: 26px !important;">24位真彩色位图没有颜色表。为了简化，只讨论24位真彩色位图。<h3 style="box-sizing: border-box; outline: 0px; margin: 8px 0px 16px; padding: 0px; font-family: &quot;PingFang SC&quot;, &quot;Microsoft YaHei&quot;, SimHei, Arial, SimSun; font-size: 22px; color: rgb(79, 79, 79); line-height: 30px; overflow-wrap: break-word; white-space: normal; background-color: rgb(255, 255, 255);"><a style="box-sizing: border-box; outline: none; margin: 0px; padding: 0px; font-weight: normal; cursor: pointer; color: rgb(78, 161, 219); overflow-wrap: break-word;" name="t8"></a><a style="box-sizing: border-box; outline: none; margin: 0px; padding: 0px; font-weight: normal; cursor: pointer; color: rgb(78, 161, 219); overflow-wrap: break-word;" name="t8"></a>1、4颜色点阵数据</h3><p style="text-align:left;box-sizing: border-box; outline: 0px; margin-top: 0px; margin-bottom: 16px; padding: 0px; color: rgb(77, 77, 77); overflow: auto hidden; overflow-wrap: break-word; font-family: -apple-system, &quot;SF UI Text&quot;, Arial, &quot;PingFang SC&quot;, &quot;Hiragino Sans GB&quot;, &quot;Microsoft YaHei&quot;, &quot;WenQuanYi Micro Hei&quot;, sans-serif, SimHei, SimSun; white-space: normal; background-color: rgb(255, 255, 255); line-height: 26px !important;">位图全部的像素，是按照自下向上，自左向右的顺序排列的。<p style="text-align:left;box-sizing: border-box; outline: 0px; margin-top: 0px; margin-bottom: 16px; padding: 0px; color: rgb(77, 77, 77); overflow: auto hidden; overflow-wrap: break-word; font-family: -apple-system, &quot;SF UI Text&quot;, Arial, &quot;PingFang SC&quot;, &quot;Hiragino Sans GB&quot;, &quot;Microsoft YaHei&quot;, &quot;WenQuanYi Micro Hei&quot;, sans-serif, SimHei, SimSun; white-space: normal; background-color: rgb(255, 255, 255); line-height: 26px !important;">RGB数据也是倒着念的，原始数据是按B、G、R的顺序排列的。<p style="text-align:left;box-sizing: border-box; outline: 0px; margin-top: 0px; margin-bottom: 16px; padding: 0px; color: rgb(77, 77, 77); overflow: auto hidden; overflow-wrap: break-word; font-family: -apple-system, &quot;SF UI Text&quot;, Arial, &quot;PingFang SC&quot;, &quot;Hiragino Sans GB&quot;, &quot;Microsoft YaHei&quot;, &quot;WenQuanYi Micro Hei&quot;, sans-serif, SimHei, SimSun; white-space: normal; background-color: rgb(255, 255, 255); line-height: 26px !important;">&nbsp;<p style="text-align:left;box-sizing: border-box; outline: 0px; margin-top: 0px; margin-bottom: 16px; padding: 0px; color: rgb(77, 77, 77); overflow: auto hidden; overflow-wrap: break-word; font-family: -apple-system, &quot;SF UI Text&quot;, Arial, &quot;PingFang SC&quot;, &quot;Hiragino Sans GB&quot;, &quot;Microsoft YaHei&quot;, &quot;WenQuanYi Micro Hei&quot;, sans-serif, SimHei, SimSun; white-space: normal; background-color: rgb(255, 255, 255); line-height: 26px !important;">&nbsp;<h1 style="box-sizing: border-box; outline: 0px; margin: 8px 0px 16px; padding: 0px; font-family: &quot;PingFang SC&quot;, &quot;Microsoft YaHei&quot;, SimHei, Arial, SimSun; font-size: 28px; color: rgb(79, 79, 79); line-height: 36px; overflow-wrap: break-word; white-space: normal; background-color: rgb(255, 255, 255);"><a style="box-sizing: border-box; outline: none; margin: 0px; padding: 0px; font-weight: normal; cursor: pointer; color: rgb(78, 161, 219); overflow-wrap: break-word;" name="t9"></a><a style="box-sizing: border-box; outline: none; margin: 0px; padding: 0px; font-weight: normal; cursor: pointer; color: rgb(78, 161, 219); overflow-wrap: break-word;" name="t9"></a>三、Photoshop和Windows的BMP文件比较</h1><p style="box-sizing: border-box; outline: 0px; margin-top: 0px; margin-bottom: 16px; padding: 0px; color: rgb(77, 77, 77); overflow: auto hidden; overflow-wrap: break-word; font-family: -apple-system, &quot;SF UI Text&quot;, Arial, &quot;PingFang SC&quot;, &quot;Hiragino Sans GB&quot;, &quot;Microsoft YaHei&quot;, &quot;WenQuanYi Micro Hei&quot;, sans-serif, SimHei, SimSun; white-space: normal; background-color: rgb(255, 255, 255); line-height: 26px !important;">Windows的BMP文件最后少了两个0字节，没有整体补位。bfSize(文件大小)，biSizeImage(全部像素大小)也相应地减去2。<p style="text-align:left;box-sizing: border-box; outline: 0px; margin-top: 0px; margin-bottom: 16px; padding: 0px; color: rgb(77, 77, 77); overflow: auto hidden; overflow-wrap: break-word; font-family: -apple-system, &quot;SF UI Text&quot;, Arial, &quot;PingFang SC&quot;, &quot;Hiragino Sans GB&quot;, &quot;Microsoft YaHei&quot;, &quot;WenQuanYi Micro Hei&quot;, sans-serif, SimHei, SimSun; white-space: normal; background-color: rgb(255, 255, 255); line-height: 26px !important;">&nbsp;<p style="text-align:left;box-sizing: border-box; outline: 0px; margin-top: 0px; margin-bottom: 16px; padding: 0px; color: rgb(77, 77, 77); overflow: auto hidden; overflow-wrap: break-word; font-family: -apple-system, &quot;SF UI Text&quot;, Arial, &quot;PingFang SC&quot;, &quot;Hiragino Sans GB&quot;, &quot;Microsoft YaHei&quot;, &quot;WenQuanYi Micro Hei&quot;, sans-serif, SimHei, SimSun; white-space: normal; background-color: rgb(255, 255, 255); line-height: 26px !important;">打开Photoshop，新建一个尺寸为2*3像素的文件：<p style="text-align:left;box-sizing: border-box; outline: 0px; margin-top: 0px; margin-bottom: 16px; padding: 0px; color: rgb(77, 77, 77); overflow: auto hidden; overflow-wrap: break-word; font-family: -apple-system, &quot;SF UI Text&quot;, Arial, &quot;PingFang SC&quot;, &quot;Hiragino Sans GB&quot;, &quot;Microsoft YaHei&quot;, &quot;WenQuanYi Micro Hei&quot;, sans-serif, SimHei, SimSun; white-space: normal; background-color: rgb(255, 255, 255); line-height: 26px !important;"><img src="https://img-blog.csdn.net/20140514114007875" alt="" style="box-sizing: border-box; outline: none; border: 0px; max-width: 100%; height: auto; overflow-wrap: break-word; cursor: zoom-in;"/> <p style="text-align:left;box-sizing: border-box; outline: 0px; margin-top: 0px; margin-bottom: 16px; padding: 0px; color: rgb(77, 77, 77); overflow: auto hidden; overflow-wrap: break-word; font-family: -apple-system, &quot;SF UI Text&quot;, Arial, &quot;PingFang SC&quot;, &quot;Hiragino Sans GB&quot;, &quot;Microsoft YaHei&quot;, &quot;WenQuanYi Micro Hei&quot;, sans-serif, SimHei, SimSun; white-space: normal; background-color: rgb(255, 255, 255); line-height: 26px !important;"> <p style="text-align:left;box-sizing: border-box; outline: 0px; margin-top: 0px; margin-bottom: 16px; padding: 0px; color: rgb(77, 77, 77); overflow: auto hidden; overflow-wrap: break-word; font-family: -apple-system, &quot;SF UI Text&quot;, Arial, &quot;PingFang SC&quot;, &quot;Hiragino Sans GB&quot;, &quot;Microsoft YaHei&quot;, &quot;WenQuanYi Micro Hei&quot;, sans-serif, SimHei, SimSun; white-space: normal; background-color: rgb(255, 255, 255); line-height: 26px !important;">放大图片到最大（1600%），然后用铅笔工具对每个像素都点一个不同颜色的点，如下图所示：<p style="text-align:left;box-sizing: border-box; outline: 0px; margin-top: 0px; margin-bottom: 16px; padding: 0px; color: rgb(77, 77, 77); overflow: auto hidden; overflow-wrap: break-word; font-family: -apple-system, &quot;SF UI Text&quot;, Arial, &quot;PingFang SC&quot;, &quot;Hiragino Sans GB&quot;, &quot;Microsoft YaHei&quot;, &quot;WenQuanYi Micro Hei&quot;, sans-serif, SimHei, SimSun; white-space: normal; background-color: rgb(255, 255, 255); line-height: 26px !important;"><img src="https://img-blog.csdn.net/20140514114012656" alt="" style="box-sizing: border-box; outline: none; border: 0px; max-width: 100%; height: auto; overflow-wrap: break-word; cursor: zoom-in;"/> <p style="text-align:left;box-sizing: border-box; outline: 0px; margin-top: 0px; margin-bottom: 16px; padding: 0px; color: rgb(77, 77, 77); overflow: auto hidden; overflow-wrap: break-word; font-family: -apple-system, &quot;SF UI Text&quot;, Arial, &quot;PingFang SC&quot;, &quot;Hiragino Sans GB&quot;, &quot;Microsoft YaHei&quot;, &quot;WenQuanYi Micro Hei&quot;, sans-serif, SimHei, SimSun; white-space: normal; background-color: rgb(255, 255, 255); line-height: 26px !important;"> <p style="text-align:left;box-sizing: border-box; outline: 0px; margin-top: 0px; margin-bottom: 16px; padding: 0px; color: rgb(77, 77, 77); overflow: auto hidden; overflow-wrap: break-word; font-family: -apple-system, &quot;SF UI Text&quot;, Arial, &quot;PingFang SC&quot;, &quot;Hiragino Sans GB&quot;, &quot;Microsoft YaHei&quot;, &quot;WenQuanYi Micro Hei&quot;, sans-serif, SimHei, SimSun; white-space: normal; background-color: rgb(255, 255, 255); line-height: 26px !important;">储存这个文件为BMP格式，文件名为“MyBmp.bmp”，在BMP选项中选择Windows，24位：<p style="text-align:left;box-sizing: border-box; outline: 0px; margin-top: 0px; margin-bottom: 16px; padding: 0px; color: rgb(77, 77, 77); overflow: auto hidden; overflow-wrap: break-word; font-family: -apple-system, &quot;SF UI Text&quot;, Arial, &quot;PingFang SC&quot;, &quot;Hiragino Sans GB&quot;, &quot;Microsoft YaHei&quot;, &quot;WenQuanYi Micro Hei&quot;, sans-serif, SimHei, SimSun; white-space: normal; background-color: rgb(255, 255, 255); line-height: 26px !important;"><img src="https://img-blog.csdn.net/20140514114017234" alt="" style="box-sizing: border-box; outline: none; border: 0px; max-width: 100%; height: auto; overflow-wrap: break-word; cursor: zoom-in;"/> <p style="text-align:left;box-sizing: border-box; outline: 0px; margin-top: 0px; margin-bottom: 16px; padding: 0px; color: rgb(77, 77, 77); overflow: auto hidden; overflow-wrap: break-word; font-family: -apple-system, &quot;SF UI Text&quot;, Arial, &quot;PingFang SC&quot;, &quot;Hiragino Sans GB&quot;, &quot;Microsoft YaHei&quot;, &quot;WenQuanYi Micro Hei&quot;, sans-serif, SimHei, SimSun; white-space: normal; background-color: rgb(255, 255, 255); line-height: 26px !important;"> <p style="box-sizing: border-box; outline: 0px; margin-top: 0px; margin-bottom: 16px; padding: 0px; color: rgb(77, 77, 77); overflow: auto hidden; overflow-wrap: break-word; font-family: -apple-system, &quot;SF UI Text&quot;, Arial, &quot;PingFang SC&quot;, &quot;Hiragino Sans GB&quot;, &quot;Microsoft YaHei&quot;, &quot;WenQuanYi Micro Hei&quot;, sans-serif, SimHei, SimSun; white-space: normal; background-color: rgb(255, 255, 255); line-height: 26px !important;">&nbsp;<img src="https://img-blog.csdn.net/20140514114021593" alt="" style="box-sizing: border-box; outline: none; border: 0px; max-width: 100%; height: auto; overflow-wrap: break-word; cursor: zoom-in;"/><p style="text-align:left;box-sizing: border-box; outline: 0px; margin-top: 0px; margin-bottom: 16px; padding: 0px; color: rgb(77, 77, 77); overflow: auto hidden; overflow-wrap: break-word; font-family: -apple-system, &quot;SF UI Text&quot;, Arial, &quot;PingFang SC&quot;, &quot;Hiragino Sans GB&quot;, &quot;Microsoft YaHei&quot;, &quot;WenQuanYi Micro Hei&quot;, sans-serif, SimHei, SimSun; white-space: normal; background-color: rgb(255, 255, 255); line-height: 26px !important;"> <p style="text-align:left;box-sizing: border-box; outline: 0px; margin-top: 0px; margin-bottom: 16px; padding: 0px; color: rgb(77, 77, 77); overflow: auto hidden; overflow-wrap: break-word; font-family: -apple-system, &quot;SF UI Text&quot;, Arial, &quot;PingFang SC&quot;, &quot;Hiragino Sans GB&quot;, &quot;Microsoft YaHei&quot;, &quot;WenQuanYi Micro Hei&quot;, sans-serif, SimHei, SimSun; white-space: normal; background-color: rgb(255, 255, 255); line-height: 26px !important;">你应该注意到图中用黑色框起来的00 00了，在每行颜色的末尾添加的两个0字节，是为了行补位。为什么要行补位呢？因为32位的Windows操作系统处理4个字节(32位)的速度比较快，所以BMP的每一行颜色占用的字节数规定为4的整数倍。MyBmp.bmp中一行颜色有两个像素，共占用6字节，如果要补齐4*2=8字节，就要再加两个0字节。<p style="text-align:left;box-sizing: border-box; outline: 0px; margin-top: 0px; margin-bottom: 16px; padding: 0px; color: rgb(77, 77, 77); overflow: auto hidden; overflow-wrap: break-word; font-family: -apple-system, &quot;SF UI Text&quot;, Arial, &quot;PingFang SC&quot;, &quot;Hiragino Sans GB&quot;, &quot;Microsoft YaHei&quot;, &quot;WenQuanYi Micro Hei&quot;, sans-serif, SimHei, SimSun; white-space: normal; background-color: rgb(255, 255, 255); line-height: 26px !important;">行补位的公式为：widthBytes = (width*biBitCount+31)/32*4<p style="text-align:left;box-sizing: border-box; outline: 0px; margin-top: 0px; margin-bottom: 16px; padding: 0px; color: rgb(77, 77, 77); overflow: auto hidden; overflow-wrap: break-word; font-family: -apple-system, &quot;SF UI Text&quot;, Arial, &quot;PingFang SC&quot;, &quot;Hiragino Sans GB&quot;, &quot;Microsoft YaHei&quot;, &quot;WenQuanYi Micro Hei&quot;, sans-serif, SimHei, SimSun; white-space: normal; background-color: rgb(255, 255, 255); line-height: 26px !important;">参数说明：<p style="text-align:left;box-sizing: border-box; outline: 0px; margin-top: 0px; margin-bottom: 16px; padding: 0px; color: rgb(77, 77, 77); overflow: auto hidden; overflow-wrap: break-word; font-family: -apple-system, &quot;SF UI Text&quot;, Arial, &quot;PingFang SC&quot;, &quot;Hiragino Sans GB&quot;, &quot;Microsoft YaHei&quot;, &quot;WenQuanYi Micro Hei&quot;, sans-serif, SimHei, SimSun; white-space: normal; background-color: rgb(255, 255, 255); line-height: 26px !important;">Width：位图的实际宽度<p style="text-align:left;box-sizing: border-box; outline: 0px; margin-top: 0px; margin-bottom: 16px; padding: 0px; color: rgb(77, 77, 77); overflow: auto hidden; overflow-wrap: break-word; font-family: -apple-system, &quot;SF UI Text&quot;, Arial, &quot;PingFang SC&quot;, &quot;Hiragino Sans GB&quot;, &quot;Microsoft YaHei&quot;, &quot;WenQuanYi Micro Hei&quot;, sans-serif, SimHei, SimSun; white-space: normal; background-color: rgb(255, 255, 255); line-height: 26px !important;">biBitCount：每个像素的位数<p style="text-align:left;box-sizing: border-box; outline: 0px; margin-top: 0px; margin-bottom: 16px; padding: 0px; color: rgb(77, 77, 77); overflow: auto hidden; overflow-wrap: break-word; font-family: -apple-system, &quot;SF UI Text&quot;, Arial, &quot;PingFang SC&quot;, &quot;Hiragino Sans GB&quot;, &quot;Microsoft YaHei&quot;, &quot;WenQuanYi Micro Hei&quot;, sans-serif, SimHei, SimSun; white-space: normal; background-color: rgb(255, 255, 255); line-height: 26px !important;">1-黑白图，4-16色，8-256色，24-真彩色<p style="text-align:left;box-sizing: border-box; outline: 0px; margin-top: 0px; margin-bottom: 16px; padding: 0px; color: rgb(77, 77, 77); overflow: auto hidden; overflow-wrap: break-word; font-family: -apple-system, &quot;SF UI Text&quot;, Arial, &quot;PingFang SC&quot;, &quot;Hiragino Sans GB&quot;, &quot;Microsoft YaHei&quot;, &quot;WenQuanYi Micro Hei&quot;, sans-serif, SimHei, SimSun; white-space: normal; background-color: rgb(255, 255, 255); line-height: 26px !important;">注：Phtoshop在文件的末尾还补充了两个0字节，好像是要整体补位。不过我看过的BMP资料中都没有提到还要整体补位的，其它软件生成的BMP文件也没有整体补位的，这看起来像是Adobe的独创，不知道目的何在。