The Study of Programming Windows with MFC--Bitmap2-优快云博客

本文详细介绍了Windows API中的::LoadImage函数。此函数不仅能够加载位图资源并创建DDB和DIB节，还支持从BMP文件加载位图，并具备颜色映射功能，能自动将特定灰度值转换为系统颜色。

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::LoadImage is to DIB sections what ::LoadBitmap and CDC::LoadBitmap are to DDBs. But it's also much more. I won't rehash all the input values it accepts because you can get that from the documentation, but here's a short summary of some of the things you can do with ::LoadImage:

Load bitmap resources, and create DDBs and DIB sections from them.
Load bitmaps stored in BMP files, and create DDBs and DIB sections from them.
Automatically convert three shades of gray (RGB (128, 128, 128), RGB (192, 192, 192), and RGB (223, 223, 223)) to the system colors COLOR_3DSHADOW, COLOR_3DFACE, and COLOR_3DLIGHT as an image is loaded.
Automatically convert the color of the pixel in the upper left corner of the bitmap to the system color COLOR_WINDOW or COLOR_3DFACE so that the pixel and others like it will be invisible against a COLOR_WINDOW or COLOR_3DFACE background.
Convert a color image to monochrome.

Keep in mind that ::LoadImage's color-mapping capabilities work only with images that contain 256 or fewer colors. DIBs with 256 or fewer colors contain built-in color tables that make color mapping fast and efficient. Rather than examine every pixel in the image to perform a color conversion, ::LoadImage simply modifies the color table.