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Opened 11 months ago

Last modified 11 months ago

#58289 new defect (bug)

No support for AVIF with HDR gain maps

Reported by: gregbenz's profile gregbenz Owned by:
Milestone: Awaiting Review Priority: normal
Severity: normal Version:
Component: Media Keywords:
Focuses: Cc:

Description

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

Change History (1)

#1 @Presskopp
11 months ago

  • Component changed from General to Media
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