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From: dale <dale@dalekelly.org>
Newsgroups: comp.graphics.apps.gnuplot
Subject: Re: Overlapping/Merge two density plot red and green scale using gnuplot
Date: Tue, 15 Nov 2016 21:45:55 -0500
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On 11/15/2016 9:13 PM, dale wrote:
> simple mixing
> (R,G,B)= R/(R+G+B) + G/(R+G+B) + B/(R+G+B)

probably made the same err you did, you do need to add the secondary 
terms if you are mixing colorants and not mixing color, an equidistant 
color space like CIELUV you don't have the other terms

R=255*(R/(R+G+B) + R+G/(R+G+B) + R+B/(R+G+B))
G ...
B ...

if you had a reference medium metric like RIMM,ERIMM,ROMM , see 
www.color.org , "reference devices" or something that is close and fits 
its purpose, you might assume equidistance there




-- 
dale | http://www.dalekelly.org