[Webkit-unassigned] [Bug 265797] New: JPG gain maps are not rendered as HDR

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=265797

            Bug ID: 265797
           Summary: JPG gain maps are not rendered as HDR
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Images
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: greg323464 at gmail.com
                CC: sabouhallawa at apple.com

JPG images with a gain map are not properly rendered as HDR (EDR) on supporting displays. These images may be created with Adobe software (ACR and Lightroom) and Android 14 (at least with the Pixel 8 Pro). Only the base SDR image is displayed, the gain map is ignored.
Spec: https://helpx.adobe.com/camera-raw/using/gain-map.html

The Chrome, Edge, Brave, and Opera web browsers all properly display gain maps (including on Android devices running Android 14). While all of those browsers are a suitable workaround on MacOS (vs using Safari), they are all dependent upon WebKit for browsing on iOS / iPadOS. Therefore, it is not possible to properly view HDR photos on Apple iPhone / iPad, which is unfortunate as Apple has some of the best hardware out there.

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