libpng warnings at startup

[VictorLamoine]

$ rosrun rviz rviz
[ INFO] [1539699041.413223554]: rviz version 1.13.1
[ INFO] [1539699041.413260869]: compiled against Qt version 5.9.5
[ INFO] [1539699041.413281630]: compiled against OGRE version 1.9.0 (Ghadamon)
libpng warning: iCCP: known incorrect sRGB profile
libpng warning: iCCP: known incorrect sRGB profile
[ INFO] [1539699041.771737540]: Stereo is NOT SUPPORTED
[ INFO] [1539699041.772558821]: OpenGl version: 3 (GLSL 1.3).
libpng warning: iCCP: known incorrect sRGB profile

[VictorLamoine]

It comes from ICC profiles inside PNG images. The PNG images have to be stripped from their profiles to avoid this kind of error.

find . -type f -name "*.png" -exec mogrify -strip {} {} \;

I still get the warnings after removing the profiles from the PNG images.

[jarvisschultz]

@VictorLamoine, I do think that your description of what is wrong is correct, and I think that the command you've provided should fix the issue. When I used your command on my rviz PNG files, my warnings disappeared.

[VictorLamoine]

You are right, I have tested again and it solves the issue, I have opened a pull request.
Thanks for testing