Color in Bitmaps - Win32 Programmer's Reference

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Color in Bitmaps

Windows handles colors in bitmaps differently than colors in pens, brushes, and text. Compatible bitmaps, created by using the CreateBitmap or CreateCompatibleBitmap function, are device specific and retain color information in a device-dependent format. No color values are used, and the colors are not subject to approximations and dithering.

Device-independent bitmaps (DIBs) retain color information either as color values or color palette indices. If color values are used, the colors are subject to approximation, but not dithering. Color palette indices can only be used with devices that support color palettes. Although Windows does not approximate or dither colors identified by indices, the resulting color may be different than that intended, because the indices yield valid results only in the context of the color palette that was current at the time the bitmap was created. If the palette changes, so do the colors in the bitmap.

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