[Tex/LaTex] warning: pdflatex> libpng warning: iCCP: known incorrect sRGB profile

graphicspngwarnings

When including .png converted with Photoshop CS6 to gray-scale I get a warning

"warning: pdflatex> libpng warning: iCCP: known incorrect sRGB profile".

To be precise, I get 36 of these warnings. 😉

What is the problem with these .png?

Best Answer

The newest libpng update (1.6.2 I believe?) has stricter rules about iCCP and will print this warning every time it finds a png that is broken. This warning can be ignored. Fixes would include:

  • Downgrade to a older version of libpng
  • Install imagemagick and convert all .png files with convert -strip (script below)
  • Maybe even just disable this warning?

In the end this is a problem that should be fixed by the maintainer of the code.

Script that would change all .png files in the current directory:

for f in $(find . -type f -name "*.png")
do
echo "Processing $f ..."
convert $f -strip $f
done
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