Ive <ive### [at] lilysoftorg> wrote:
> Am 8/5/2017 um 23:27 schrieb Kenneth:
> >
> > Another test-image post-- hopefully my final gamma test... ;-)

>
> actually this PNG image has a embedded gamma of 2.0 and the image you
> did post earlier (the dark one) has a gamma chunk of 4.4 - and this
> doesn't make any sense at all.

WOW, that's... crazy. I don't even know what to make of it. *Thanks* for
checking this out. One idea that occurs to me (which could be wrong, of course)
is that posting a PNG to the newsgroups changes the gamma... perhaps twice, for
the two different-sized previews. ?? Otherwise, it's a mysterious problem with
several interrelated causes, my Photoshop being only one of them.

If you don't mind doing so, would you check the gamma chunk in the 'raw' POV-Ray
PNG image I posted, the one that begins with this:
"One more image test, again for my own purposes: This PNG is *directly* from
POV-Ray (and NOT post-processed in Photoshop.)..."

I'm curious to know what *that* turns out to be.
>
> Which PS version do you use? Adobe changed the handling of various image
> file format between different versions a lot and especially Photoshop's
> handling of PNG in anything older than CS6 is known to be flawed.
>

Version 5.0, I'm embarassed to say. And yes, I also read somewhere that such
'older' versions had some kind of flaw in their handling of PNGs... although I
don't know the technicalities.

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