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libpng warnings about sRGB profiles - determine which files are meant and disable warning [duplicate]

After some LaTeX or system updates, I get these new warnings for something that was typeset perfectly before: libpng warning: iCCP: Not recognizing known sRGB profile that has been edited Since ...
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1answer
1k views

RGB Colors in TikZ and conversion with ghost script to PNG

Since a few days I am trying to find a solution for the folowing problem: I am creating a Tikz picture with a simple rectangele and fill the rectange with a special RGB color. The code looks like ...