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Re: [csswg-drafts] [css-color-hdr-1] Compositing SDR in HDR outputs (#5323)

From: Chris Lilley via GitHub <sysbot+gh@w3.org>
Date: Sat, 12 Sep 2020 11:37:14 +0000
To: public-css-archive@w3.org
Message-ID: <issue_comment.created-691474697-1599910633-sysbot+gh@w3.org>
> The issue appears when the SDR image is mapped to be part of an HDR image (e.g. as picture-in-picture on a video stream) or alongside an HDR image. 

I expect that to be the majority use case.

Does that mean the HDR highlights become the primary white adaptive stimulus, or that the viewing condition changes? It seems we are getting into color appearance modelling (simultaneously viewed colors).

>  The presence of specular highlights will affect the shadows and mid-tones perception of the scaled SDR image - the peak brightness will look correct.

So, that requires re-rendering of the SDR image?  Also, we are talking about scaling a linear-light image not a gamma-encoded image, right?

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