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Re: [fxtf-drafts] Luminance masking is slower than alpha masking

From: Brian Birtles via GitHub <sysbot+gh@w3.org>
Date: Thu, 27 Apr 2017 23:54:33 +0000
To: public-fxtf-archive@w3.org
Message-ID: <issue_comment.created-297870537-1493337271-sysbot+gh@w3.org>
I don't have an opinion about its usefulness except to mention that it was added for compatibility with SVG where luminance is the default. In terms of compatibility, at the very least, when the `mask` property is applied to an SVG element and refers to an SVG `<mask>`, it needs to use luminance. Beyond that we'd probably have to measure how much content uses this to determine if it can be changed.

(As for why SVG has that behavior, I can only guess that it was based on what authoring tools such as Photoshop do?)

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Received on Thursday, 27 April 2017 23:54:39 UTC

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