Bug 305407

Summary: HDR images render as SDR while CSS transitions are active
Product: WebKit Reporter: Greg <greg323464>
Component: Layout and RenderingAssignee: Nobody <webkit-unassigned>
Status: NEW    
Severity: Normal CC: ap, bfulgham, sabouhallawa, simon.fraser, webkit-bug-importer, zalan
Priority: P2 Keywords: InRadar
Version: Safari Technology Preview   
Hardware: Unspecified   
OS: macOS 26   

Greg
Reported 2026-01-13 11:23:30 PST
When CSS transitions are active (even in elements below the image), an HDR gain map will render as just the SDR base image while the transition is active. Mouse in / out with the grid at this example page to see the issue in Safari: https://gregbenzphotography.com/gain-map-gallery/
Attachments
Radar WebKit Bug Importer
Comment 1 2026-01-13 11:23:36 PST
Alexey Proskuryakov
Comment 2 2026-01-13 15:53:23 PST
Thank you for the report! I do indeed see images sometimes falling back to SDR, although I'm not sure if it's while transitions are active. One way or another, this page works as expected in Chrome, and not in Safari.
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