Path: utzoo!censor!becker!douglee
From: douglee@becker.UUCP (Doug Lee)
Newsgroups: comp.sys.amiga.tech
Subject: Re: Color compression routines (4096 to 256) wanted.
Keywords: HAM, 256 color, Amiga, Sun
Message-ID: <483@becker.UUCP>
Date: 6 May 89 20:37:46 GMT
References: <33747@kilowatt.uucp> <3404@ihlpm.ATT.COM> <33761@kilowatt.uucp> <254@xdos.UUCP> <482@becker.UUCP>
Reply-To: douglee@becker.UUCP (Doug Lee)
Organization: G. T. S., Toronto, Ontario
Lines: 27

In article <482@becker.UUCP> bdb@becker.UUCP (Bruce Becker) writes:
>In article <254@xdos.UUCP> doug@xdos.UUCP (Doug Merritt) writes:
>|In article <3404@ihlpm.ATT.COM> jmdavis@ihlpm.ATT.COM (Davis) writes:
>|>Second, I wouldn't weigh BLUE as heavily as I would RED and
>|>GREEN. BLUE is harder for humans to see.
>|
>|This amounts to gamma correction, doesn't it?
>
>	Nope.

I can't stand just a simple Nope without an explaination:-). Gamma correction
is nonlinear amplification applied to the video signal's amplitude to compensate
for the fact that television picture tubes are nonlinear EG: twice as much 
video level doesn't make the picture twice as bright. Correction for this is
always applied in TV cameras (Commercial ones, I don't know about the cheap
home ones). The ratio between R G and B signals when mixed to produce monochrome
is something else entirely. The ratio is something like 11% Blue, 59% Green and 
the rest Red. These are not necessarily the CORRECT figures as I don't have
them right here. If anyone really needs to know, I can look it up later.
			    <<<Doug>>>

>
>-- 
>   __	 Bruce Becker	Toronto, Ont.
>w \cc/	 Internet: bdb@becker.UUCP, bruce@gpu.utcs.toronto.edu
> `/v/-e	 BitNet:   BECKER@HUMBER.BITNET
>_<  >_	 "Where is Newton Minow now that we need him?" - T. S. Eliot