BITMAPINFOHEADER2 Field - cclrUsed

cclrUsed (ULONG)

Number of color indexes used. A 0 value (default) means all the colors are used. For a nonzero value, only the first cclrUsed entries in the color table are accessed. The rest can be omitted.

For standard formats, with a cBitCount of 1, 4, or 8, any indexes beyond the value in this field are invalid. For example, a bitmap with 64 colors can use the 8-bit count format without having to supply the other 192 entries in the color table. For the standard 24-bit count, this field contains the number of colors used by the bitmap.

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