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Old 30th September 2015, 01:10   #2  |  Link
poisondeathray
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Join Date: Sep 2007
Posts: 5,340
Actually exiftool reports a gamma of 1 in the source image - this might be the difference . In firefox for windows, the image appears like imagesource (less contrast) too , but in image editors like photoshop, irfanview, etc.. it appears like coronasequence

Does anyone know of a "jpegsnoop" -like program for PNG ?

EDIT: TweakPNG - it also reports a gamma of 1.0



Summary - it appears different applications handle the gAMA chunk in PNG differently . If you strip it with TweakPNG, then it will give the higher contrast version in all (most) applications .

So it appears there is a difference between imagesource() and coronasequence() handling of PNG images, when there is a gamma specified


references:
http://www.libpng.org/pub/png/book/c...png.ch10.div.2
https://hsivonen.fi/png-gamma/
http://jonathannicol.com/blog/2006/1...ing-png-gamma/

Last edited by poisondeathray; 30th September 2015 at 01:37.
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