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Re: Minutes Sydney 2009 F2F day 2

From: Alex Danilo <alex@abbra.com>
Date: Tue, 17 Feb 2009 22:56:28 +1100
Message-Id: <46L7FK.XMDKL3LOB7Y5@abbra.com>
To: "public-svg-wg@w3.org" <public-svg-wg@w3.org>

Hi guys,

--Original Message--:
>   AG: i think we need to put clipping and masking in the spec, since
>   that's what we resolved
>   ... but we could add it later, and publish this now
>   ... it is publishable as it is
>   ... the other day i sent an email out to benjamin who had posted
>   that question about the soft-light equations
>   ... i went to the pdf spec and got the new equations for color-dodge
>   and color-burn, and soft-light
>   ... but i didn't quite agree with his equation for soft-light, how
>   he derived it from the pdf spec (for the alpha case)
>   ... so i sent my derivations of the equations
>   ... i think we are ok to publish what we've got
>   ... the compositing spec follows the adobe compositing model
>   [20]http://www.w3.org/mid/4994BF8F.1050302@cisra.canon.com.au
>     [20] http://www.w3.org/mid/4994BF8F.1050302@cisra.canon.com.au
>   AG: benjamin's and my equations come up with slightly different
>   numbers
>   CM: could you create a pdf file and check the colours to determine
>   which is correct?
>   ... did asv6 support these compositing features?
>   CL: don't know, i think it did but i'm not sure

ASV3 supports Adobe private namespace extensions and has support for
the attribute 'adobe-blending-mode'.

That blending mode attribute supports all 13 of the blend modes
proposed in the compositing chapter.

A simple s/adobe-blending-mode/comp-op/ makes the content compatible
with what was proposed for 1.2.

The test examples work perfectly in ASV3 if you edit them and go:
(assuming you've declared the Adobe private namespace
as xmlns:a="http://ns.adobe.com/AdobeSVGViewerExtensions/3.0/".)

So, it should be trivial to check the equations using ASV3. Illustrator
emits content that exercises the blend modes quite easily.

Verification should be simple enough.

I'll refrain from commenting in regard to the Porter-Duff operators...

Received on Tuesday, 17 February 2009 11:57:09 UTC

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