Comment on PNG has been updated for the first time in 22 years — new spec supports HDR and animation

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Tetsuo@jlai.lu ⁨2⁩ ⁨days⁩ ago

I’m probably gonna be massively downvoted for saying the forbidden word but I asked AI to do a summary with references of the forward and backward compatibility of PNG’s new version:

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Based on recent search results, the new PNG specification (Third Edition) and its reference library (libpng) maintain strong backward compatibility while introducing modern features. Here’s a detailed compatibility analysis:

🔄 1. Backward Compatibility (Viewing Old PNGs with New Lib)

⚠️ 2. Forward Compatibility (Viewing New PNGs with Old Lib)

📊 Compatibility Summary

Scenario Compatibility Key Considerations
Old PNG → New Lib ✅ Excellent Legacy files work flawlessly; security improved.
New PNG → Old Lib ⚠️ Partial Basic rendering works, but HDR/APNG/EXIF ignored. Security risks in unpatched versions.
New Features 🔧 Conditional Requires updated apps (e.g., Photoshop, browsers) and OS support .

🔧 3. Implementation and Industry Adoption

💎 Conclusion

For developers: Use png_get_valid(png_ptr, info_ptr, PNG_INFO_mDCv) to check HDR support and provide fallbacks .

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