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RE: Logo-Gretag ColorLab Bug ?
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RE: Logo-Gretag ColorLab Bug ?


  • Subject: RE: Logo-Gretag ColorLab Bug ?
  • From: "Peter Baumbach" <email@hidden>
  • Date: Sun, 23 Feb 2003 17:26:00 +0100

>From: "Bob Chase" <email@hidden>
>Date: Sat, 22 Feb 2003 20:59:54 -0500
>
>Does anyone have access to the prior Windows version of Gretag's freeware
>ColorLab utility? (2.7.7 is the only version for Windows currently
>available
>on the web-site.) Unfortunately, the current version mangles Lab
>Tiffs when
>opening or exporting.
>
>I'd like to obtain a zip or stuffit file containing the prior Windows
>version, or if anyone knows of a workaround for the current bug, that would
>be most appreciated. Thanks.

While testing my input profiles as suggested in "Real World Color
Management" it seems that I have the same problem with ColorLab version 2.8
on mac OS X and OS 9.2. If I convert a target text file to tiff format and
open it in Photoshop the colors are completely changed (e.g. LAB (50,0,0) to
(50 -128 -128)). It looks like a number problem: L is ok but (a,b) are 128
too low. Or am I doing something wrong in ColorLab? And if I create a tiff
measurement file in Photoshop and open it later in ColorLab the same effect
appears vice versa (only with mac OS X). Any idea?

Regards,
Peter Baumbach

PS: Real World Color Management is an excellent book. Many thanks and
congratulation to Bruce, Chris, and Fred.
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