Support ISO 21496-1, the HDR over JPG standard via Gain Map with SDR fallback. Apple/Google support

[BeakerBen]

Apple and Google have cooperatively agreed to support ISO 21496-1, the HDR over JPG standard using Gain Maps, with SDR fallback if the monitor is SDR and/or the software only supports JPG. Apple calls ISO 21496-1 "Adaptive HDR".

ISO 21496-1 is already supported in Chromium browsers on Windows, as well as Android 15, iOS 18, iPadOS 18, and macOS 15.

https://www.androidauthority.com/google-apple-hdr-photo-standard-3495035/ 

Please, add ISO 21496-1 support to Firefox.

Adobe "Gain Map", AKA Google "Ultra HDR", AKA Samsung "Super HDR", a very similar gain map technique for HDR with SDR fallback, would also be great to support. But since ISO 21496-1 has become the cross-platform standard, it makes sense ISO 21496-1 should be the highest priority. (In Android 15, photos are encoded simultaneously with Ultra HDR and ISO 21496-1). More info on gain maps generally:

https://gregbenzphotography.com/hdr/#gainMaps 

The previous Mozilla Connect Idea to support Ultra HDR is here:

https://connect.mozilla.org/t5/ideas/support-for-quot-ultra-hdr-quot-aka-quot-jpg-hdr-gain-map-quot/... 

[Jon]

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