[Webkit-unassigned] [Bug 270981] JPEG with HDR renders incorrectly

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=270981

Greg <greg323464 at gmail.com> changed:

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                 CC|                            |greg323464 at gmail.com

--- Comment #2 from Greg <greg323464 at gmail.com> ---
That is a simple 8-bit JPG encoded with the PQ tone curve. That format is insufficient to avoid banding with HDR and I would not necessarily expect support (JXL or AVIF would be suitable for simple PQ encoding due to their higher bit-depth capabilities).

A JPG with a "gain map" would also be suitable for HDR (and ideal as gain maps better support SDR display than a tone mapped HDR), but will render as just the base SDR image in Safari / WebKit (they have never supported any HDR photo formats I've tested).

Adobe Lightroom / ACR offer great tools for creating your own JPG gain maps: https://gregbenzphotography.com/hdr-photos/jpg-hdr-gain-maps-in-adobe-camera-raw/

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