Re: Photoshop Lab values
Re: Photoshop Lab values
- Subject: Re: Photoshop Lab values
- From: Steve Upton <email@hidden>
- Date: Mon, 9 Jul 2007 23:39:33 -0700
At 10:48 AM +1000 7/10/07, Graeme Gill wrote:
>Marco Ugolini wrote:
>
>>You can see that clipping very clearly in ColorThink, where the blue end of the profile's
> > gamut looks like it has hit a wall and got flattened by the impact.
>
>This would be a limitation of ColorThink. Any real system will have numerical
>limits in it somewhere. Often when dealing with ICC based color a*b* limits
>of +/- 128 are assumed.
Yes, a little more clearly, it is a limitation imposed by ColorThink. The idea is to have the graphing represent the limitations imposed by the user's typical workflow, which, as you noted is -128 to 127 for a and b.
Though this limitation is not always in place in ICC workflows when XYZ is used as the PCS but it is pretty rare to have XYZ as the PCS for print profiles.
Regards,
Steve
________________________________________________________________________
o Steve Upton CHROMiX www.chromix.com
o (hueman) 866.CHROMiX
o email@hidden 206.985.6837
o ColorGear ColorThink ColorValet ColorSmarts ProfileCentral
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