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/