hi,

William F Pokorny <ano### [at] anonymousorg> wrote:
> On 3/6/22 08:35, jr wrote:
> > if you ever recall why, ...
>
> OK. Found my related debugging newsgroup post.
>
> Much more detail on the v3.8/v4.0 sRGB block issue being written nor not
> can be found in a Mar 20, 2021 post to povray.beta-test. "File png/ppm
> gamma issues. v3.8." See:
> [snip]

thanks (very much).  so recent, yet, I've no memory of reading the thread.  :-(

> ...
> Aside: Because broken v3.71/v3.8/v4.0 versions do still write a gamma
> 2.2 chunk, the differences visually be will be small / hard to 'see' -
> they're at the dark end. This probably why the bug went years not
> getting picked up. It's one of those insidious subtle bugs that cause
> confusing / hair pulling results when they do bite.

guessing that you "look closer" than I do.  also, I "misuse" gamma perhaps,
mixing sRGB light_source and rgb[ft] colours routinely, bad either the result is
ok-ish or my eyes are not up to it (anymore) :-).


regards, jr.

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