some question about chromatic adaptation and redering intent?

Hello Marti Maria,

When I make color convertion with profile and lcms, if I
only want to
convert the device depend color to PCS color,
do I need take account of chromatic adaptation? Do I need
take account
of white map between two color space? or whether
did the rendering intent already include such process?
Many many thanks,
haityang



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Hi,

The ICC profile already takes care of chromatic adaptation,
and this is up to the rendering intent. On perceptual,
relative colorimetric and saturation, there is a chromatic
adaptation and a white point scaling, so white always maps
to white no matter which illuminant and paper chromaticity.
On the absolute colorimetric intent, lcms allows you to
switch
between v4-absolute colorimetric (observer is fully adapted
to illuminant) or v2-style abs. colorimetric (observer with
no
adaptation). That latter is an advanced feature, is
controlled by cmsSetAdaptationState() and shouldn't be
used unless strongly required.

Regards
Marti Maria
The littleCMS project
http://www.littlecms.com



----- Original Message ----- 
From: "ÑÌÎ" <haitao_yangfoxitsoftware.com>
To: <lcms-userlists.sourceforge.net>
Sent: Monday, June 11, 2007 4:09 AM
Subject: [Lcms-user] some question about chromatic
adaptation and 
rederingintent?


Hello Marti Maria,

When I make color convertion with profile and lcms, if I
only want to
convert the device depend color to PCS color,
do I need take account of chromatic adaptation? Do I need
take account
of white map between two color space? or whether
did the rendering intent already include such process?
Many many thanks,
haityang





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Download DB2 Express C - the FREE version of DB2 express and
take
control of your XML. No limits. Just data. Click to get it
now.
http://sourcefor
ge.net/powerbar/db2/


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Download DB2 Express C - the FREE version of DB2 express and
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control of your XML. No limits. Just data. Click to get it
now.
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_______________________________________________
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https://lists.sourceforge.net/lists/listinfo/lcms-user