Re: Photoshop Gamut warning vs ColorThink
Re: Photoshop Gamut warning vs ColorThink
- Subject: Re: Photoshop Gamut warning vs ColorThink
- From: Chris Cox <email@hidden>
- Date: Thu, 21 Feb 2008 12:33:01 -0800
- Thread-topic: Photoshop Gamut warning vs ColorThink
Yes, I'm still lurking.
Without a useable gamut table, round trip deltas are the only way you can
determine the gamut of the profile. Yes, it's not perfect and depends on
the accuracy of the forward and reverse colorimetric tables in the profile
-- but with the information available, that's the best you can get (AFAIK).
If someone has a better method, please let us know.
BTW - I don't believe Photoshop ever used the gamut warning tag, because we
never found one that was accurate.
Chris
>> 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
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