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List:       openjdk-2d-dev
Subject:    [OpenJDK 2D-Dev] OpenJDK and lcms color management (soft-proofing)
From:       aph () redhat ! com (Andrew Haley)
Date:       2012-07-12 14:14:30
Message-ID: 4FFEDBC6.5090008 () redhat ! com
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On 07/12/2012 02:40 PM, Claudio Wilmanns wrote:
>> You know the whitepoints of your source space and your target space:
>> they're in the colour profiles.  Create a matrix that is the inverse
>> of the transform from source to target whitepoint and apply it to your
>> source image.  Then do your relative output transform.  The transform
>> you just did is the inverse of the whitepoint transform that relative
>> colorimetic rendering does: it'll cancel.  If you have tools to create
>> colour profiles, you can create a profile that does exactly this
>> transform, and LCMS would then do exactly what you want.
>>
>> But if this is all like Greek to you I'm afraid I can't help.  And I
>> cannot vouch for the quality of the results of any such procedure -- it
>> would lose some accuracy, for sure.  And it'll be inconvenient.
> 
> No, that?s not Greek to me at all ;-) All I wanted to know is if what I
> was thinking of it is the same as what you thought of.
> 
> Basically you are suggesting to recover the absolute colorimetric data
> from the relative colorimetric data in the profile and create a new
> ?absolute? colorimetric profile, even though LCMS (or KCMS) uses the
> relative coloriemtric rendering intent, right? Or in one word, to build a
> special softproofing-profile.

That's right.  Evil, but I think it'll work.

Andrew.

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