[wp-trac] [WordPress Trac] #58289: No support for AVIF with HDR gain maps

[WordPress Trac]

#58289: No support for AVIF with HDR gain maps
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 Reporter:  gregbenz      |      Owner:  (none)
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  General       |    Version:
 Severity:  normal        |   Keywords:
  Focuses:                |
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 HDR ("high dynamic range") images offer vastly improved image quality on
 supporting hardware (see here for more details: ).

 When displaying an HDR image on an SDR (standard dynamic range) screen,
 the image needs to be "tone mapped" to fit the reduced dynamic range of
 the screen. That can provide mediocre results, and a separate SDR version
 of the image will usually look better on an SDR monitor. Supplying two
 versions of the same image is complicated, and that is the reason for the
 new "gain map" proposal.

 Adobe has published the gain map specification (and test images) at
 https://helpx.adobe.com/camera-raw/using/gain-map.html#resources and
 Chrome Canary already supports proper rendering of the JPG gain map (be
 sure to view on a true HDR display, such as the M1 / M2 MacBook Pro).

 AVIF gain maps offer an ideal way to share HDR content in a format which
 is much smaller than a JPG gain map.

 This issue depends on getting support for HDR AVIF (ie an HDR image
 without a gain map): https://core.trac.wordpress.org/ticket/51228

 It is also related to concepts involved with JPG gain maps:
 https://core.trac.wordpress.org/ticket/58288#ticket

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Ticket URL: <https://core.trac.wordpress.org/ticket/58289>
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