- From: Dirk Schulze <dschulze@adobe.com>
- Date: Tue, 24 Sep 2013 23:27:10 -0700
- To: Rik Cabanier <cabanier@gmail.com>
- CC: "Tab Atkins Jr." <jackalmage@gmail.com>, Simon Sapin <simon.sapin@exyr.org>, www-style list <www-style@w3.org>
On Sep 25, 2013, at 7:50 AM, Rik Cabanier <cabanier@gmail.com> wrote: > > > > On Tue, Sep 24, 2013 at 10:29 PM, Dirk Schulze <dschulze@adobe.com> wrote: > > On Sep 25, 2013, at 7:20 AM, Rik Cabanier <cabanier@gmail.com> wrote: > > > > > > > > > On Tue, Sep 24, 2013 at 10:15 PM, Dirk Schulze <dschulze@adobe.com> wrote: > > > > On Sep 25, 2013, at 12:43 AM, Rik Cabanier <cabanier@gmail.com> wrote: > > > > > On Tue, Sep 24, 2013 at 3:25 PM, Tab Atkins Jr. <jackalmage@gmail.com> wrote: > > > On Tue, Sep 24, 2013 at 3:14 PM, Rik Cabanier <cabanier@gmail.com> wrote: > > > > On Tue, Sep 24, 2013 at 2:58 PM, Tab Atkins Jr. <jackalmage@gmail.com> > > > > wrote: > > > >> On Tue, Sep 24, 2013 at 2:31 PM, Rik Cabanier <cabanier@gmail.com> wrote: > > > >> > The compositing/blending spec doesn't talk about converting colors [1] > > > >> > All > > > >> > the formulas (except for 4 special ones) work on individual color > > > >> > channels, > > > >> > regardless of what they represent. > > > >> > > > >> Those channels appear to be assumed to be RGB. > > > > > > > > Can you point out where that is so I can update the spec? > > > > > > Hmm, I guess it actually doesn't. The few examples that give explicit > > > color numbers are all written with RGB, but there's nothing outside > > > the examples that actually talks about the color value. > > > > > > Great. I made a not to add CMYK (and spot?) examples for the next version. > > > > We already have CMYK so the note would make sense in this level already, wouldn't it? > > > > Is there any support for CMYK as an output color space? > > > > Even though WebKit does not preserve CMYK (and transforms it into RGB) for CSS, it has proper CMYK handling in Canvas (in Safari). And CSS Compositing addresses Canvas as well. > > > > Really? Canvas is always RGBA; how would you create a CMYK canvas? > > You can specify CMYK colors for drawing and WebKit/Safari does exactly that. It draws with the specified CMYK colors. > > Sure, but you won't draw CMYK pixels. The color is somehow converted to RGB and then the operation draws with the converted color. The stroke operation for example is done with: CGContextSetCMYKStrokeColor(); Greetings, Dirk
Received on Wednesday, 25 September 2013 06:27:59 UTC