Re: [Lcms-user] N-Color -> Lab conversion

[<mar...@li...>]

Hi,

Humm... on my test profiles lcms2 works fine on multichannel. 
Do you have a sample profile that demostrates the issue?
Have you tried also tificc utility?

Regards
Marti

Original Message:
-----------------
From: Andrea Galligani da...@ti...
Date: Thu, 21 Jul 2011 13:04:08 +0200
To: lcm...@li...
Subject: [Lcms-user] N-Color -> Lab conversion


Hi,

I found some problem converting N-Color images in Lab.

The main problem is that the result is different using lcms 1.17 and 
lcms 2.2.
Typically lcms 2.2 results are reddish and more contrasted.

Do you know exist something that explain this difference?

The problem is not present if I use CMYK profiles.
I use the same method in both cases changing the input format.
Do you know if I should do something different between N-Color -> Lab and
CMYK -> Lab transformation?
Does it exist some reference tool to convert an N-Color image to a Lab one?

Note:
Separated images are generated by Photoshop CS4 converting
Lab images using the same parameters used in the reverse transformation;
the same ICC profile, Absolute Colorimetric intent, No black point 
compensation and No dither.


Best regards
Andrea


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