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Article View: comp.sys.amiga.graphics
Article #9175

Re: colour numbers in pictures.

#9175
From: Wooly Mittens
Date: Fri, 12 Apr 1996 17:43
36 lines
1787 bytes
Andrew Bruno wrote:
> 
> Hello....
> 
> In an iff piccie the colour numbers are:
> 
> 2, 4, 8, 16, 32, 64, 128 and 256.
> 
> But the number used MAY be less.
> 
> Is there a program that allows "me" to reduce the number of used colours from
> say 32 to 24?

It' wouldn't do you any good: the way it works is as follows
you get a bitmap that you can put pixels on and are displayed on screen
                    00000000
                    00011000
                    00100100
                    00011000 black square with small white circle)
                    00000000 
but with one layer of 1's and zero's you'd get only 2 posibilities(colors) for
each pixel.
So we overlay another bitmap on top of it this doubles the posibilities
from 2 colors to 4 every pixel could have either 00,01,10 or 11

adding another bit per pixel would double the fun again from 4 to 8 colors
000,001,010,011,100,101,110,111

You could continue doing this from 2,4,8,16,32,64,128,256 colors with
                                   1,2,3, 4, 5, 6,  7,  8 bit per pixel

and since half a bit does not exist reducing colors from 32 to 24 would
not decrease the size of the bitmap (though maybe the pallete but it is small
anyway) and thus be nogood in particular to anybody.

Wooly Mittens
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Path: arc1-ca.pugleaf.net!tudelft.nl!news
From: Wooly Mittens <0201367@ptfe12.hro.nl>
Newsgroups: comp.sys.amiga.graphics
Subject: Re: colour numbers in pictures.
Date: Fri, 12 Apr 1996 10:43:28 -0700
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