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 15:25:10 -0800
At 5:53 PM -0500 2/21/08, email@hidden wrote:
>Chris Cox writes on Thu, 21 Feb 2008 12:33:01 -0800
>
>> ..but with the information available, that's the best you can get
>(AFAIK).
>
>I would agree. A gamut determined in this fashion (A2Bx/B2Ax round trips)
>reflects the constraints imposed by TAC, max inkings, K strategy, etc. and
>is the gamut of interest to anyone who wants gamut alarm information.
<big snip>
>Anyone using the A2B1 transform from this profile to derive a gamut would
>be computing the maximum physical gamut of this inkset without any of the
>constraints mentioned above. A gamut derived by round tripping (A2Bx/B2Ax)
>would reflect these contraints and is the useful information which is
>sought by anyone wanting a gamut alarm.
Hi Harold,
You may have swayed me... I may have been stuck on my desire to map a device gamut as accurately as possible and overlooked the specific need of a graphics professional determining output choices in Photoshop...
I do have some reservations though:
I do not think that gamut warning should vary by the output intent (including BPC).... or perhaps the UI should change to allow more informed intent choices.
One of the main reasons I train people on the gamut warning function is to teach them the concept of gamut AND the idea that they may want to make different rendering intent choices depending on their image's relationship to the output gamut.
While I do understand that different intents will affect the resulting image gamut, overall I feel it is the job of soft proofing rather than gamut warning to inform the user.
To me, gamut warning is about how my image relates to the gamut of my output device. The warning informs me (hopefully) which colors are out of gamut and likely to be affected the most. I can then make different decisions such as changing the rendering intent (possibly introducing changes to all my colors because of my desires for specific colors) or even changing papers or devices.
A gamut warning that is determined from a chosen intent (or intents in a round trip), tells me how a specific intent's resulting gamut relates to my image. Unfortunately it does so in a threshold manner, implying a true/false in/out good/bad judgement that isn't really there. As a user, I think I'm mislead as I am receiving a mixed message.
Let's leave the quality judgements to the soft proof and simplify the gamut warning.... either that or rename it so people will have different expectations...
Regards,
Steve
________________________________________________________________________
o Steve Upton CHROMiX www.chromix.com
o (hueman) 866.CHROMiX
________________________________________________________________________
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