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Re: [fxtf-drafts] [filter-effects] Luminance coefficients are slightly changed from SVG 1.1

From: Chris Lilley via GitHub <sysbot+gh@w3.org>
Date: Wed, 28 Jun 2017 02:27:34 +0000
To: public-fxtf-archive@w3.org
Message-ID: <issue_comment.created-311539252-1498616853-sysbot+gh@w3.org>
 These values come from the conversion from sRGB primaries to CIE XYZ (in this case, just Y which is luminance). To a higher precision, the correct values are:
0.2126729  0.7151522  0.0721750
rounded to 4 significant figures that would be
 0.212**7** 0.7151  0.07218
but my preference would simply be to use the higher precision values 9in both SVG and in filters). 
SVG 1.1 should be errata'd.

For a fuller description, see http://www.brucelindbloom.com/index.html?Eqn_RGB_XYZ_Matrix.html

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Received on Wednesday, 28 June 2017 02:27:41 UTC

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