- From: Alex Danilo <alex@abbra.com>
- Date: Sun, 24 Apr 2011 17:29:35 +1000
- To: Rik Cabanier <cabanier@gmail.com>
- Cc: public-fx@w3.org, www-svg <www-svg@w3.org>
Hi Rik, --Original Message--: >Hi Alex, > >I read in today's CSS WG meeting notes that everyone is OK with the spec as-is. In a way it's too bad that it will be ratified in its current state since it is not specific enough. >If it is adopted, can we get started on the next version on short notice? Sounds good to me. >As stated before, the following things need to happen: >- add additional comments for knockout. The current section is very vague. >- split up the spec into PorterDuff and regular blending. Describe exactly how the blending is supposed to happen in each scenario. >- add a section on grouping and how it affects blending. I'm unsure if grouping can work with PD so it might become part of the regular blending. >- work on adding additional blend modes. All that sounds sensible - we should be able to provide implementation for the additional blend modes once we agree on what the additional set should be. Alex >Rik > >On Thu, Apr 14, 2011 at 9:44 PM, Alex Danilo <alex@abbra.com> wrote: > >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 Sunday, 24 April 2011 07:30:04 UTC