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Re: [css-gcpm][css-color] device-cmyk() interaction with RGB-space colors.

From: Brad Kemper <brad.kemper@gmail.com>
Date: Thu, 26 Sep 2013 07:47:28 -0700
Message-Id: <85DF95B7-8971-4246-8017-22F2217B3B94@gmail.com>
Cc: Rik Cabanier <cabanier@gmail.com>, Chris Lilley <chris@w3.org>, "Tab Atkins Jr." <jackalmage@gmail.com>, Simon Sapin <simon.sapin@exyr.org>, www-style list <www-style@w3.org>
To: Henrik Andersson <henke@henke37.cjb.net>

> On Sep 26, 2013, at 4:35 AM, Henrik Andersson <henke@henke37.cjb.net> wrote:
> 
> Rik Cabanier skriver:
>> 
>> 5. How to handle content that has an RGB only operation (such as a
>> colormatrix filter) during export to CMYK
> 
> Wouldn't that particular filter make just as much sense as per channel
> blend modes? After all, it is a per channel operation. Kinda.
> 
> It would obviously need a dedicated configuration for other color
> spaces, but the operation itself should make sense.
> 
> Question is, has anyone actually tried using a color matrix on anything
> besides RGB? Not counting shenanigans to setup the matrix to convert to
> rgb before the main effect...

I don't know much about the colormatrix filter, but for something like 'opacity', I don't see how you wouldn't convert cmyk to rgb before mixing channels. One is subtractive color and the other is additive.
Received on Thursday, 26 September 2013 14:47:56 UTC

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