W3C home > Mailing lists > Public > www-style@w3.org > September 2013

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

From: Rik Cabanier <cabanier@gmail.com>
Date: Thu, 26 Sep 2013 14:01:21 -0700
Message-ID: <CAGN7qDC-p6S9rCWdmSSc2SRkV8ij5eMN3EwQW=QRiNPFc9+aVw@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 1:21 PM, Rik Cabanier <cabanier@gmail.com> wrote:

>
>
>
> 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.
>

FYI Photoshop's channel mixer can apply a color matrix to CMYK data.
Received on Thursday, 26 September 2013 21:01:52 UTC

This archive was generated by hypermail 2.4.0 : Friday, 25 March 2022 10:08:34 UTC