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

From: Rik Cabanier <cabanier@gmail.com>
Date: Thu, 26 Sep 2013 13:21:25 -0700
Message-ID: <CAGN7qDAh3g59g+YqMrKnfS6N7wHMZo8LinArWq6L=SzZmhTZBw@mail.gmail.com>
To: Henrik Andersson <henke@henke37.cjb.net>
Cc: Chris Lilley <chris@w3.org>, "Tab Atkins Jr." <jackalmage@gmail.com>, Simon Sapin <simon.sapin@exyr.org>, www-style list <www-style@w3.org>
On Thu, 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.

not really. Color matrix [1] uses a 4x5 matrix.
To do the same thing in CMYK, you'd need a 5x6 one.

PDF/Adobe allows you to see a colorspace for a blending operation but in
almost all cases it's the same colorspace as the document.

> 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'm not sure. I could ask our PhotoShop people.
Received on Thursday, 26 September 2013 20:21:52 UTC

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