LAB as working/interchange space
LAB as working/interchange space
- Subject: LAB as working/interchange space
- From: Roger Breton <email@hidden>
- Date: Wed, 30 May 2001 08:25:36 -0400
Roger Breton wote:
>
> So there are "CIE" Lab and "ICC" Lab. Different encodings. OK. How about
>
> Photoshop's own Lab? Which flavor of Lab is it exactly? Apart from the fact
>
> that everyone knows that it is D50/2?
To which Chris Cox replied:
>
Photoshop uses ICC LAB.
>
>
The differences in LAB values could be accounted for by a number of
>
things: intent, Black Point Compensation, use of different CMMs
>
(using different intermediate representations), etc.
>
>
Chris
To which Roger Breton adds:
There are no transformation involved here, Chris. The experience I relate is
that of displaying an already converted CMYK image in Photoshop 6 as opposed
to opening the same image in LinoColor, ProfileEditor and ColorFlow! If I
understand correctly, all these apps - including yours - all work off the
same ICC profile, then, to calculate the displayed Lab values? So, the
difference can only stem from application differences in interpreting the
profile tags, right?
--
Roger Breton
Quibec Institute of Graphic Communications
Montrial (Quibec) Canada T. (514) 389-5061 F. (514) 389-5840
email@hidden