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Re: [css3-color] New last call for comments on CSS Color

From: Chris Murphy <lists@colorremedies.com>
Date: Mon, 21 Jul 2008 23:47:10 -0400
Cc: www-style@w3.org
Message-Id: <5B48260D-5B1C-47CE-881F-014DEF0B7ADD@colorremedies.com>
To: L. David Baron <dbaron@dbaron.org>

That whole paragraph.

I think what happens to values outside the display's gamut is up to  
the CMS being used. There is no one right way to deal with out of  
gamut colors. The spec even says it should be either clipped or gamut  
mapped. I'm not thinking of a third option, but if there is one, and  
it's not recommended that would be nice to know (perhaps more  
interesting than relevant).

And also it says clipped or mapped, but only when the gamut is known.  
If it's not known, then what? The spec doesn't say what to do if it's  
not known.

If the goal is to get consistency among browsers, then color  
management needs to be required, and the exact transformation process  
needs to be required also. That requires a level of specificity that  
is not in the current language.

If the goal is merely to suggest that color management should be done  
in order to have a chance at preserving color appearance, then let's  
leave it at that. Each UA will have to decide whether to clip, or to  
map. And if they map, how they map.

Chris Murphy


On Jul 21, 2008, at 10:42 PM, L. David Baron wrote:

> On Monday 2008-07-21 21:29 -0400, Chris Murphy wrote:
>> Paragraph starting with "Values outside the device gamut should be
>> slipped...when the gamut is known." I'd remove the whole. The phrase
>> "For a typical CRT monitor, whose device gamut is the same as  
>> sRGB..."
>> demonstrates a fundamental problem that we have with the LCD world of
>> today in that there is no typical LCD display and their gamut can be
>> decidedly smaller than that of sRGB.
>
> Remove the whole what?
>
> We should say something about what happens to values outside the
> device gamut.
>
> -David
>
> -- 
> L. David Baron                                 http://dbaron.org/
> Mozilla Corporation                       http://www.mozilla.com/
Received on Tuesday, 22 July 2008 03:50:41 GMT

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