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Re: [css4-color] unclamped values for RGB

From: Rik Cabanier <cabanier@gmail.com>
Date: Mon, 9 Jul 2012 20:53:06 -0700
Message-ID: <CAGN7qDA1A-YZ0un9TjLrH8D-Mae-tiGMYV7k1b6yvkg2SRMf_w@mail.gmail.com>
To: Bjoern Hoehrmann <derhoermi@gmx.net>
Cc: www-style list <www-style@w3.org>
I have been talking to some of the color experts at Adobe and it turns out
that there are some use cases for unclamped colors that are used in some
advanced features in our products.
It still seems like too advanced of a feature that will make basic color
managment hard to implement.

I will respond to the list once I have more info.


On Sun, Jun 17, 2012 at 12:18 PM, Rik Cabanier <cabanier@gmail.com> wrote:

> On Sat, Jun 16, 2012 at 2:34 AM, Bjoern Hoehrmann <derhoermi@gmx.net>wrote:
>> * Rik Cabanier wrote:
>> >I think this feature should be dropped and replaced with something that
>> is
>> >colorimetrically correct. This could be Lab or the ability to specify
>> what
>> >profile the author intends to use (or both :-0)
>> You seem to be arguing for implementations of the color-profile and ren-
>> dering-intent "properties" that are in SVG 1.1 and semi-are [sic] in CSS
>> Level 3 Color. Could you restate the problem you see assuming that all
>> the CSS implementation support those features reasonably well?
> I haven't thought all of this through yet. :-)
> The problem I see with the current spec, is that it is wrong and that it
> will make decent color management in the future impossible. CMS is
> primarily about mapping gamuts from one colorspace to another [1]. By
> removing the clamping, the gamut is made infinite so this becomes
> impossible.
> I think if CSS implements the SVG color-profile property [2] (without the
> <name> keyword), that would be a great step forward. Old implementations
> would ignore it, so their colors will look slightly off but would most
> likely still be reasonable.
> Lab would be really great since it corresponds to how we perceive color.
> This makes gradients and meshes more pleasing to the eye and has no need
> for profiles from the user's side.
> It's not unthinkable that in the near future there will be a race for best
> color displays (like there now is for resolution) so it would be good to be
> prepared.
> Rik
> [1] http://en.wikipedia.org/wiki/Color_management#Gamut_mapping
> [2] http://www.w3.org/TR/SVG/color.html#ColorProfileProperty
Received on Tuesday, 10 July 2012 03:53:35 UTC

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