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PNG has been updated for the first time in 22 years — new spec supports HDR and animation
(www.tomshardware.com)
This is a most excellent place for technology news and articles.
APNG is what they're using in v3, so all many libraries need to do* is update that code for HDR.
* surely that's easy, right?
I mean, on a Linux system that's not riddled with flatpak / snap / ... You'd basically only need to update libpng and you'd be good.