POV-Ray : Newsgroups : povray.beta-test : [Doc] gray equation : Re: [Doc] gray equation Server Time
29 Jul 2024 08:14:32 EDT (-0400)
  Re: [Doc] gray equation  
From: Scott Moore
Date: 11 Jun 2002 06:28:39
Message: <p2kbgugbfiq699qlvg1cr5bsumir90n0mg@4ax.com>
On Tue, 11 Jun 2002 10:25:33 +0200, Le Forgeron <jgr### [at] freefr>
wrote:

>Version 3.5.beta.RC6.icl.win32
>(was already signaled for RC5)
>
>In 6.5.4.2 Functions in Isosurface,
>
>the equation for the .gray is bogus, it is given as
>   gray value = Red*58.9% + Green*11.4% + Blue*29.7%
>
>which means that Red would be brighter than Blue which would be brigher than Green.
>IMHO, for the human eyes, it should be
>   gray value = Red*29.7% + Green*58.9% + Blue*11.4%
>(Because Green is brighter than Red which is brighter than Blue)
>
>Or at least something in the line like : 60% Green, 30% Red, 10%Blue
>and not 60% Red, 30% Blue, 10% Green

I agree - gray should say Red*29.7% + Green*58.9% + Blue*11.4%

Scott


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