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

From: Alan Gresley <alan@css-class.com>
Date: Sat, 28 Sep 2013 16:37:04 +1000
Message-ID: <52467910.7050603@css-class.com>
To: Chris Lilley <chris@w3.org>
CC: "Tab Atkins Jr." <jackalmage@gmail.com>, Rik Cabanier <cabanier@gmail.com>, Simon Sapin <simon.sapin@exyr.org>, www-style list <www-style@w3.org>
On 25/09/2013 9:23 PM, Chris Lilley wrote:
> Hello Tab,
> Wednesday, September 25, 2013, 12:25:28 AM, you wrote:
>> On Tue, Sep 24, 2013 at 3:14 PM, Rik Cabanier <cabanier@gmail.com> wrote:
>>> On Tue, Sep 24, 2013 at 2:58 PM, Tab Atkins Jr. <jackalmage@gmail.com>
>>>> I doubt that this "just use the channels" approach is compatible with
>>>> some other color spaces, like Lab, though.
>>> It is compatible. You can try it in PhotoShop :-)
> It is compatible because it is an additive colour space.
>> How does that work, though?  I mean, HSL doesn't work in a "just use
>> the channels" approach,
> HSL isn't an additive colour space; its syntactic sugar for RGB and
> thus you composite the RGB values.
>>   which is why the HSL blend modes are
>> non-separable.  Why would Lab work?
> Because Lab is an additive colourspace with orthogonal channels.

Can you point me to a display device that shows Lab or is this just 

FYI, you can display segments of cyan and fuchsia (magenta) and convert 
it to segments of white and blue so in theory, some subtractive color 
can be manipulated to mimic parts of additive colorspace.


Alan Gresley
Received on Saturday, 28 September 2013 06:37:33 UTC

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