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

On Thu, Sep 12, 2013 at 12:54 PM, Simon Sapin <simon.sapin@exyr.org> wrote:

> Le 12/09/2013 21:27, Rik Cabanier a écrit :
>
>
>> Drawing (= rasterization + compositing + blending + filters) should be
>> done in the colorspace of the output device.
>> In this case, if you have an element that uses CMYK colors, those colors
>> should be converted to RGB and then you interpolate them.
>>
>
> Do you mean to RGB on screen and to CMYK for priting?


Yes


>
>
>
>  There should be a standard CMYK profile for this conversion and there
>> should probably be a way to change this profile (so you can specify SWOP
>> or EuroScale).
>>
>
> Maybe, but that’s different from the feature specified in GCPM (and that
> we just decided to move into Color) which does *device* CMYK, where the
> profile is intentionally unspecified.


Sure, but if you're showing it on screen, you have to convert it to RGB as
some point.
What is the profile for that conversion?


>
>
>
>  Rendering in the output device color space does imply that printing and
>> display will look different. Maybe there's also a need to specify the
>> colorspace of the document.
>>
>
>
> --
> Simon Sapin
>