W3C home > Mailing lists > Public > www-style@w3.org > July 2009

Re: [CSS3 Colors] HSL colors, hue and allowed values, [CSS3 gcpm] CMYK colors and allowed values.

From: Chris Murphy <lists@colorremedies.com>
Date: Thu, 30 Jul 2009 23:26:37 -0400
Cc: David Perrell <davidp@hpaa.com>, Brad Kemper <brad.kemper@gmail.com>
Message-Id: <FD4F331C-1B0B-4900-9BB5-73FCD83358DB@colorremedies.com>
To: W3C style mailing list <www-style@w3.org>
What is and is not "perceptual" or "uniform" or whatever isn't the  
issue. In my view, those who advocate putting in CMYK support into CSS  
have the burden of demonstrating why their data can only be encoded in  
CMYK, and why some other encoding is insufficient. Again, nothing  
prevents an application from presenting CMYK UI controls to the user,  
and then encoding them in sRGB in CSS data.

And then, advocates of CMYK need to understand that untagged CMYK is  
ambiguous color. In my view, that's a perversion to insert into a  
modern page description language. We know better than that. It's  
sloppy and lazy to just haphazardly put in something because we think  
it's what we want for extremely vertical and niche reasons. We should  
be thinking of specific examples of why this encoding is necessary,  
and then how to ensure the color defined in such a space is not  
ambiguous because what we've learned about the digital world is a SHIT  
TON of this content will be created and it will last practically  
forever. So if we screw it up it's going to take a long time and a lot  
more effort to fix it.

See 1980's, 1990's design to print workflows.

Chris Murphy
Color Remedies (TM)
New York, NY
Co-author "Real World Color Management, 2nd Ed"

On Jul 30, 2009, at 11:00 PM, Brad Kemper wrote:

> RGB is not a perceptual color spec. RGB specifies pixel color values
> to be used in CRT or LCD monitors. How it is eventually perceived  
> depends on monitor
> manufacture, user adjustments, monitor age, room temperature, how  
> long the monitor has been turned on, lighting, the color of items  
> near the monitor, and other variables.
> On Jul 30, 2009, at 7:21 PM, "David Perrell" <davidp@hpaa.com> wrote:
>> CMYK is not a perceptual color spec. CMYK specifies halftone screen  
>> values
>> to be used in offset printing. How it is eventually perceived  
>> depends on ink
>> manufacture, printing press adjustments, paper stock, lighting and  
>> other
>> variables. I don't understand why the CSS
Received on Friday, 31 July 2009 03:27:22 UTC

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