[Webkit-unassigned] [Bug 250813] REGRESSION (iOS16): Component above video is turning gray on iOS

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=250813

Jer Noble <jer.noble at apple.com> changed:

           What    |Removed                     |Added
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                 CC|                            |jer.noble at apple.com

--- Comment #5 from Jer Noble <jer.noble at apple.com> ---
(In reply to Peter from comment #4)
> RE SDR vs HDR—is the iPhone expected to not support HDR videos?
> 
> Either way, is there more information on how what formats the iPhone works
> best with?

No, the problem is that the iPhone _does_ support HDR videos. But the "white" in the HDR video is brighter than the "white" of the text, which is why the text looks grey when overlayed atop the HDR video content.

This looks like it's behaving correctly. The whole point of HDR videos is that they're "brighter" than CSS #FFFFFF, and "darker" than CSS #000000. Their dynamic range is high.

In order to display the "high dynamic range" colors in the video, the device's backlight ramps up to produce more visible light. SDR content is then ramped down by an equal amount to account for this. The SDR text colors are perceived as "grey" when displayed next to the super white colors of the video.

So this is HDR videos behaving correctly, or at least, as expected.

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