Unable to input grayscale PNG
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- C++
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Description
**Describe the bug**
The binary in the link below allows it, but the google/jpegli one does not allow grayscale input.
https://github.com/libjxl/libjxl/releases/download/v0.10.3/jxl-x64-windows-static.zip
**To Reproduce**
The following message appears when a grayscale PNG image is input
libpng warning: iCCP: profile 'icc': 'GRAY': Gray color space not permitted on RGB PNG
Failed to decode input image S:\Temp\18.png
**Environment**
- OS:Windows 10 Pro 22H2
- CPU type: AMD64
- cjxl/djxl version string: 3e50579
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