ISSUE-2095: Algorithm for soft-light blend mode

soft-light blend mode

Algorithm for soft-light blend mode

State:

PENDING REVIEW

Product:

Module: Compositing

Raised by:

Doug Schepers

Opened on:

2008-10-08

Description:

Benjamin Otte
<http://lists.w3.org/Archives/Public/www-svg/2008Oct/0029.html>:
[[
I'm in the process of implementing bend modes in the Cairo imaging
library[1]. As Cairo is used as the renderer for a wide variety of
formats, I wanted to have an as comprehensive list of blend modes as
possible. And it turns out that the blend mode algorithms used are
almost always equal. However, there is one exception: soft-light. The
latest SVG draft specifies a different algorithm than PDF.

So I was wondering if it was possible to change the algorithm in SVG
to match the one of PDF, as that would solve a lot of problems.
]]

Related Actions Items:

• ACTION-2427 on Anthony Grasso to Use the formulae from ISSUE-2095 to update the Compositing module - due 2009-02-05, closed

Related emails:

1. Minutes, Mar 12, 2009 telcon (from cam@mcc.id.au on 2009-03-13)
2. Re: ISSUE-2095 (soft-light blend mode): Algorithm for soft-light blend mode [Module: Filters] (from anthony.grasso@cisra.canon.com.au on 2009-02-13)
3. Re: ISSUE-2095 (soft-light blend mode): Algorithm for soft-light blend mode [Module: Filters] (from schepers@w3.org on 2009-02-12)
4. [minutes] Jan 29, 2009 telcon (from schepers@w3.org on 2009-02-01)
5. Re: Agenda, Jan 29, 2009 telcon (from chris@w3.org on 2009-01-29)
6. Re: ISSUE-2095 (soft-light blend mode): Algorithm for soft-light blend mode [Module: Filters] (from alex@abbra.com on 2008-10-10)
7. Re: ISSUE-2095 (soft-light blend mode): Algorithm for soft-light blend mode [Module: Filters] (from otte@gnome.org on 2008-10-09)
8. Re: ISSUE-2095 (soft-light blend mode): Algorithm for soft-light blend mode [Module: Filters] (from alex@abbra.com on 2008-10-09)
9. Re: Algorithm for soft-light blend mode (ISSUE-2095) (from ed@opera.com on 2008-10-09)
10. Re: ISSUE-2095 (soft-light blend mode): Algorithm for soft-light blend mode [Module: Filters] (from otte@gnome.org on 2008-10-09)
11. Re: ISSUE-2095 (soft-light blend mode): Algorithm for soft-light blend mode [Module: Filters] (from alex@abbra.com on 2008-10-09)
12. Re: Algorithm for soft-light blend mode (ISSUE-2095) (from schepers@w3.org on 2008-10-08)
13. ISSUE-2095 (soft-light blend mode): Algorithm for soft-light blend mode [Module: Filters] (from sysbot+tracker@w3.org on 2008-10-08)

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