Re: Photoshop Gamut warning vs ColorThink
Re: Photoshop Gamut warning vs ColorThink
- Subject: Re: Photoshop Gamut warning vs ColorThink
- From: Steve Upton <email@hidden>
- Date: Thu, 21 Feb 2008 09:58:03 -0800
At 10:24 AM -0700 2/21/08, Andrew Rodney wrote:
>On 2/21/08 10:11 AM, "Steve Upton" wrote:
>
>> Actually I'm not sure this is true. I remember inquiring about this a long
>> time ago and receiving a response from Chris Cox that Adobe had given up on
>> the gamut tag as they are notoriously unreliable.
>
>On a totally unrelated topic, I got this email which I think describes how
>the gamut warning (which I find useless since V5 of Photoshop's Custom Soft
>proof) works:
>
>On 2/6/08 9:07 AM, "Jack Holm" wrote:
>
>> Also, since the Adobe Photoshop gamut warning determines the gamut boundary
>> by looking at round-tripping errors, it is good that this profile has
> > relatively small round-tripping errors for a 3D LUT profile.
Interesting... I'm not sure if Photoshop uses this technique or not but I do know that I am NOT a fan of this method.
I have had a number of people propose this method of determining gamut boundary but using round-trip errors is subject to profile rendering errors. And as I see profile rendering errors relatively often, I have no faith in this method. We use the gamut boundary as described by the proofing part of the profile. As I can confirm the accuracy of this profile component down to the delta-E I have much more faith in it!
Jack is a very experienced color scientist and I respect his opinion on many things but I don't know if his information regarding Photoshop is correct. I also doubt that Adobe uses this technique but I've been wrong before.....
Mr Cox... are you lurking?
Regards,
Steve
________________________________________________________________________
o Steve Upton CHROMiX www.chromix.com
o (hueman) 866.CHROMiX
________________________________________________________________________
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