POV-Ray : Newsgroups : povray.binaries.images : city buildings-- WIP 2 : Re: city buildings-- WIP 2 Server Time: 22 Oct 2017 21:01:20 GMT
  Re: city buildings-- WIP 2  
From: Kenneth
Date: 26 Aug 2017 18:35:04
clipka <ano### [at] anonymousorg> wrote:
> Am 05.08.2017 um 21:29 schrieb Kenneth:
>
> > I also downloaded my own original PNG image post (the one shown in these
> > screenshots), and it appears correct in *all* of my various image-viewer apps,
> > no gamma change.
>
> Then you should ditch all your various image-viewer apps, as they all
> seem to disregard the PNG file specification regarding gamma.
>
> Get LILYsoft's IC, which is the best image viewer/converter for Windows
> I've seen so far. OpenEXR and Radiance HDR support included, and written
> by POV-Ray community member "Ive".

(Sorry for the long delay; I had to deal with real-life.)

SO... I RE-downloaded my first image in this post-- the PNG file with the crazy
4.4 gamma-- and ran it through all of my image-viewer apps again (including
Lilysoft... which I *just* downloaded--thanks for the heads-up.) I made
screenshots of all of the results, and combined them into a JPEG.

It *appears* that only Firefox and Lilysoft are showing the image with its
'correct' (i.e., *mistaken*) built-in image-gamma of 4.4; the rest of the apps
are showing the image *as-I-see-it* in POV-Ray (i.e., *visually* correct*, but
certainly not at gamma 4.4.) My dilemma-- prior to this comparison-- was that
ALL of the apps that I normally use to view images (excluding Firefox) were
showing the image *as I originally saw it* (my concept of 'correct') and NOT at
its actual goofed-up 4.4 gamma.

The strange thing is, most of my image apps are relatively up-to-date (excluding
Photoshop, and maybe my Windows Photo Viewer.) I downloaded the rest of them
over the past six months, or perhaps a year at most.

Which leaves me with the bigger question: Which app to trust when viewing PNG
images?? I suppose Firefox and Lilysoft are the only answers :-(


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