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PNG image format receives HDR and animation support in first spec update in decades
(www.techspot.com)
this post was submitted on 29 Jun 2025
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It's good to see that lots of programs already support some or all of the changes, but I didn't see anything in the article regarding backwards compatibility. EG if you have an animated PNG will older programs error out or just display the first frame?
APNG will display the first frame on app that doesn't support animation.
I would need to read the full spec for be 100% sure, but the PNG format makes it easy to make backwards compatible extensions so I would be surprised if there's anything in the new spec that isn't.
Yeah from a quick glance over the spec it's basically just small clarifications, promoting existing extensions (EXIF and APNG) to the core spec, and adding the new HDR metadata chunks.
The HDR stuff will be hit or miss, it's backwards compatible in the sense that a viewer that doesn't understand it will fall back to the ICC profile, but that still requires the viewer to support the (now deprecated) ICC based HDR method. If it doesn't support HDR at all then you're just out of luck since these images just require fundamentally different ways to view them.