[wp-trac] [WordPress Trac] #58288: No support for JPG with HDR gain maps

[WordPress Trac]

#58288: No support for JPG 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 v115 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).

 JPG gain maps (with an SDR base image) offer an ideal way to support HDR
 as we all transition to HDR over time. They will display in an ideal way
 on both an SDR or an HDR display. And they will safely display as SDR in
 browsers which do not understand gain maps.

 When a JPG with a gain map is uploaded to the WordPress media library, it
 is converted to an SDR JPG. The gain map is lost and therefore the image
 will no longer properly display as HDR when viewed on HDR hardware using a
 browser which supports HDR gain maps (such as Chrome).

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Ticket URL: <https://core.trac.wordpress.org/ticket/58288>
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