16位位图图象的结构是什么样的？

Question

to newer007:16位图称为位图不知到是否合适。
好象是一个像素用16位表示（两个字节），但我不知道具体结构是什么样的

Answer 1

BITMAPINFOHEADER有一个biCompression域
表示的是图像的压缩格式
如果是BI_RGB的话,就是无压缩
BI_RLE的就表示每个象素占8个位
BI_BITFIELDS也表示没有压缩,但是在后面会紧跟一个32位的整数
可以作为RGB的三种颜色的掩码.现在关键是压缩方式了
对16位色,如果是BI_RGB,那么后面是有调色板的,数目为biClrUsed域
如果这个域为0的话,也就是没有调色板了.
如果压缩方式是BI_BITFIELDS
那么调色板部分有三个WORD类型的短整数,当然它不是调色板了,而是颜色的掩码.
颜色掩码的方式常见的有两种
5-5-5格式和5-6-5格式两种对于16位色的位图,主要的难点就在这里
知道这个结构了,就比较好写程序了的.

Answer 2

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