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Extensibility of PNG has been amply used, as intended, for proprietary chunks that hold application specific data (e.g. PICO-8 games) without bothering other software.





Doesn't pico-8 store the data in the least significant bits of colour? Maybe it got updated to use chunks.

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Yes, my mistake. I assumed common sense.

https://pico-8.fandom.com/wiki/P8PNGFileFormat

Actual cases of proprietary chunks include iDOT from Apple (apparently a performance optimization for plain images)

https://www.hackerfactor.com/blog/index.php?/archives/895-Co...

and the Macromedia Fireworks save files

https://stackoverflow.com/questions/4242402/the-fireworks-pn...

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