"Kenneth" <kdw### [at] gmailcom> wrote:
> Another test-image post-- hopefully my final gamma test... ;-)
>
> This PNG render is post-processed in Photoshop, but I CHANGED my usual 2.2 gamma
> there (in PS) to 1.0. *IF* this image shows up correctly here-- in both small
> and large previews-- then I will at least have solved the major part of my *own*
> problem...
>

Success!! Both preview sizes here look identical, and correct--well, with maybe
a *very slight* washed-out appearance in both-- but that could be from a number
of reasons on my end, and is unimportant in the bigger scheme of things ;-)

SO... it seems that my use of Photoshop-- at its *typical* gamma setting of
2.2-- was introducing a gamma change into the POV-Ray PNG image. I have aways
assumed 2.2 to be the correct gamma in PS, for any/all PNG images that I've
downloaded from the 'net, and even for Photoshop-created PNG images. But it's
NOT correct for post-processing a POV-Ray PNG render: a PS gamma of 1.0 is
necessary (at least for both of the newsgroup's two preview sizes to show up
correctly!) So, *something* is amiss somewhere-- either a flaw in my version of
Photoshop, OR in how the newsgroups treat preview images.

By the way, these are my POV-Ray render settings:
A) assumed_gamma 1.0 in the scene file
B) Display_Gamma of 'srgb' in my .ini file
C) File_Gamma of 'srgb' in my .ini file

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