24 bpp to 8 bpp

I need an algorithm which passes from a BMP image of 24 bits per pixel to 8 bits per pixel
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ciriAuthor Commented:
Edited text of question
ciriAuthor Commented:
Adjusted points to 90
Here's a reference to that problem:

Heckbert, P. S.  (1984).  "tECHNIQUES FOR rEAL-tIME fRAME bUFFER Animation,"   Computer FX '84 Conference, London.  (Mapping RGB Triples onto Four Bits)

ciriAuthor Commented:
I'm going to delete this question, becouse I've resolved my own question.
It's only to create a palette (with 256 colours) and each color takes a range of 65000 of the true color.
check out
ImageMagic includes a program "convert".
The source is included, so you can check!

hope this would help you


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