How to Fix the 'libpng warning: iCCP: known incorrect sRGB profile' Error in SDL?

Unexpected 'libpng warning: iCCP: known incorrect sRGB profile' Error

When attempting to load a PNG image using SDL, users may encounter the following error message:

libpng warning: iCCP: known incorrect sRGB profile

This warning results from the stricter validation of ICC profiles implemented in Libpng-1.6 compared to earlier versions.

To resolve this issue, consider the following options:

Ignoring the Warning

For applications that treat warnings as errors, ignoring the warning may be acceptable.

Removing the iCCP Chunk

Eliminating the warning requires removing the invalid iCCP chunk from the PNG image. This can be accomplished using:

ImageMagick

• Convert individual images:

  convert in.png out.png

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• Remove the chunk from multiple images:

  mogrify *.png

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Note: Ensure ImageMagick is built with Libpng16. Verify using:

convert -list format | grep PNG

Windows

For Windows users, use ImageMagick through the command prompt:

magick.exe mogrify *.png

pngcrush

Identify problematic files:

pngcrush -n -q *.png

Note: Requires pngcrush to be installed.

Binary Releases and Additional Notes

• Binary releases of ImageMagick can be found here: [Binary Releases of ImageMagick](https://imagemagick.org/script/download.php)
• For Android Studio projects, navigate to the res folder before using ImageMagick commands.

By addressing the iCCP chunk issue, users can successfully load PNG images and eliminate the warning message.

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