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Re: [csswg-drafts] [css-color] Separation / DeviceN color support (#2023)

From: Mike Bremford via GitHub <sysbot+gh@w3.org>
Date: Mon, 25 Jan 2021 17:51:35 +0000
To: public-css-archive@w3.org
Message-ID: <issue_comment.created-766997584-1611597094-sysbot+gh@w3.org>
> Of course interpolation on a device without the ink available will happen in the fallback space, and as we know this looks pretty rubbish with Lab. Lch would be ideal except it's not available in PDF. I can simulate a gradient between two Lch colors in Lab quite easily, by dividing the gradient up into sections until the delta-E is close enough. But when generating a PDF I can't do this with spot colors defined against Lch; the decision on whether to interpolate in the named-ink or the fallback-color doesn't happen until the device rendering the PDF.

Actually I'm wrong about this. It is possible to interpolate in the fallback space if the fallback space is Lch. It won't accurately represent how the blending would work on paper if the device had the inks available, but I've just done it so it's definitely possible.

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