How to convert 24 bit RGB to 8 bit RGB

c colors rgb 8-bit 24-bit
Gootik picture Gootik · Oct 5, 2011 · Viewed 14.7k times · Source

I was wondering what is the best way to convert a 24-bit RGB color (8 bits per color) into an 8-bit color (2bits Blue, 3 Green, 3 Red). I'd like C code for doing this.

Answer

Roman R. picture Roman R. · Oct 5, 2011

8 bit RGB is normally an indexed (palettized) color format, see Palette (computing).

The way you described it though, getting 8 bpp out of 24 bpp is pretty straightforward - you would need to strip least significant bits and merge the bits into single byte value, per pixel. AFAIK it is not a standard or well-known pixel color representation.

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