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Re: [csswg-drafts] [css-color] black point compensation (#299)

From: Chris Lilley via GitHub <sysbot+gh@w3.org>
Date: Tue, 08 Sep 2020 15:48:55 +0000
To: public-css-archive@w3.org
Message-ID: <issue_comment.created-688968293-1599580134-sysbot+gh@w3.org>
ICC 4.2 defines rendering intents including blackpoint compensation. This is primarily useful for CMYK where, epecially on poorer quality papers, the deepest black is much lighter than Lab 0 0 0.

For RGB colorspaces, it is typical to convery assuming RGB 0 0 0 is Lab 0 0 0 and then do any flare compensation as a separate step.

For video, especially narrowband video with headroom and footroom, a PLUGE signal is used to set a true black.

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