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Re: Comments on SVG Compositing

From: Alex Danilo <alex@abbra.com>
Date: Fri, 15 Apr 2011 14:44:27 +1000
Message-Id: <3UFOJL.ACKQR3BKETXL@abbra.com>
To: Rik Cabanier <cabanier@gmail.com>
Cc: public-fx@w3.org, www-svg <www-svg@w3.org>
Hi Rik,

--Original Message--:
><snip/>
>As an aside, we probably also want to extend the list of blending modes. 
>For instance, the current list is missing the following PDF blendmodes: hue | saturation | color | luminosity
>Flash also defines some useful basic blendmodes (such as 'erase') that could be of interest.

I totally agree that would be a good idea. At the time we did the original blending modes, I had to work out the equations from scratch since they
were not publlished anywhere (i.e. pre-date the PDF spec.). So we started
by looking at what Photoshop seemed to do and then did the math to take
into account source and destination alpha. The result had some errors that
have been fixed over time.

For the best round-tripping scenarios with Quartz2D as well as AIM,
I think adding these would be a great idea.

Alex
Received on Friday, 15 April 2011 04:46:51 GMT

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