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On 2/25/23 08:24, Bald Eagle wrote:
> William F Pokorny <ano### [at] anonymous org> wrote:
>
>> An Alert! Related to (b), and my memory is foggy, but some number of
>> official v3.8 releases, and over some period of time on github, the
>> color to grey scale conversion in certain situations had a significant bug.
>
> All I remember is that some folks commented that there was the 255 256 division
> issue:
> http://news.povray.org/5782990f%40news.povray.org
>
> I found a color conversion equation someone was using (probably for a shader)
> that claimed to take into account the differnce in eye response to the different
> color wavelengths:
> (Y = 0.2126R + 0.7152G + 0.0722B).
>
> POV-Ray color conversion equations:
> http://news.povray.org/web.577e98cbff0686005e7df57c0%40news.povray.org
>
> clipka says .hf is mentioned in the isosurface tutorial
> http://news.povray.org/57822645%241%40news.povray.org
> And so it is, about halfway down, at the bottom of noise and pigment functions
>
> https://wiki.povray.org/content/Documentation:Tutorial_Section_3.2
>
>
> Here was my take:
> http://news.povray.org/web.577ee122ff0686005e7df57c0%40news.povray.org
>
> - BW
>
Not the issue I was remembering... Can I find it. Ah the updated, paid,
google search did turn it up!
https://news.povray.org/povray.unix/thread/%3C60144c97%241%40news.povray.org%3E/
Guess I wasn't sure about the bug-ness on initially posting and it ended
up in p.unix.
Thanks for the references! I need to run, but I'll look them over later.
Bill P.
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