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CSS filters +color-interpolation-filters (was: RE: Agenda, 16 February 2012 SVG WG telcon)

From: Rik Cabanier <cabanier@adobe.com>
Date: Mon, 20 Feb 2012 15:38:11 -0800
To: "'Chris Lilley'" <chris@w3.org>, Erik Dahlstrom <ed@opera.com>
CC: "public-svg-wg@w3.org" <public-svg-wg@w3.org>
Message-ID: <3087C3EE109D634A82116DB24F8B48450BCFB3@nambx09.corp.adobe.com>
Hi Chris,

The discussion should be about a).
What colorspace will be used by the CSS shorthand filters including the CSS shaders?
If there is a need for both sRGB and linearRGB, how would we specify this in CSS?

For b), we can have another discussion on how to move color handling forward.
I honestly believe that linearRGB should not be the default. I understand that it is more colorimetrically correct, but for 99% of users it is not.
A colormatrix that divides by 2, should just do that. A gradient from green to red should be 50% red and green in the middle.
Now, for the pixars of the world that DO understand the intricacies of CMS, there should be a way to get DIC handling. The color-interpolation property gets you part of the way but I think we could make it a lot better.

Rik

> -----Original Message-----
> From: Chris Lilley [mailto:chris@w3.org]
> Sent: Thursday, February 16, 2012 4:50 AM
> To: Erik Dahlstrom
> Cc: public-svg-wg@w3.org
> Subject: Re: Agenda, 16 February 2012 SVG WG telcon
> 
> On Thursday, February 16, 2012, 10:14:36 AM, Erik wrote:
> 
> ED> Missed one thing:
> 
> ED> * color-interpolation-filters
> ED>
> ED>
> http://www.w3.org/mid/CAGN7qDDh_yJX_EzWNtuvW3N_eywgvB3MioMn6F
> oP_p8kH
> ED> Twh-A@mail.gmail.com
> 
> 
> Are we discussing:
> 
> a) how to specify the longhand, element-based equivalent to each of the css
> shorthand properties (which will include the value of the color-interpolation-
> filters property,
> 
> or
> 
> b) whether to remove color-interpolation-filters and color-interpolation, thus
> breaking backwards compatibility and destroying improvements in color
> management in SVG2, because of flawed understanding of basic concepts like
> gamma, chromaticity, and so forth?
> 
> If a) then I am all in favour of providing the longhand equivalents and would like
> to see tests that put the longhand and shorthand side by side so we can check
> that implementors are doing the right thing.
> 
> If b) and we are seriously considering legislating the dumb approach to RGB,
> then I have strong objections to such a wrong-headed approach.
> 
> I can provide links to further reading if people need to brush up on basic
> concepts.
> 
> 
> --
>  Chris Lilley   Technical Director, Interaction Domain
>  W3C Graphics Activity Lead, Fonts Activity Lead  Co-Chair, W3C Hypertext CG
> Member, CSS, WebFonts, SVG Working Groups
> 
Received on Monday, 20 February 2012 23:38:46 UTC

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