Re: Photoshop CS4 DeviceLink CMM Engine
Re: Photoshop CS4 DeviceLink CMM Engine
- Subject: Re: Photoshop CS4 DeviceLink CMM Engine
- From: Steve Upton <email@hidden>
- Date: Tue, 28 Apr 2009 12:14:30 -0700
At 11:46 AM -0700 4/28/09, Marco Ugolini wrote:
>
>It seems that the device link conversion feature in Photoshop CS4 is still a
>first step, a rough introduction to the functionality, with much room for
>improvement -- which hopefully will come.
>
>One question I have, though, is the following: do *all* device link profiles
>contain precise information on the destination color space, or a copy of the
>destination profile within them? If they don't, how would Photoshop know
>which profile to assign post-conversion, if and when it should be made
>capable of doing that?
No, in fact *none* of them do. *none* being a qualified answer to mean that the spec doesn't allow for the specification / inclusion of source / destination profiles in any *standard, documented* way.
So if the spec doesn't allow it, it can't be done (at least according to the spec).
Proprietary solutions which combine a profile that contains private tags with a CMM / workflow tool that can use those tags is the only solution available today.
And, for the record, I don't consider it a bug. It is an inconvenience due to a lack of features in the spec.
Also, there are certainly a bunch of situations where assigning a new ICC profile post-transform is not required or desired. Device links can perform all sorts of jobs on CMYK/RGB data while retaining the same color space as the source image.
As far as I see it Adobe did about as much as they could with link transforms that stay in the same color model. I would have liked to have seen the ability to change color models as well but then there would be a bunch of complaints about the destination space in that case.
It seems that the first place to start is to help the ICC amend the spec to include better meta data in the device link profiles themselves. Then we can take the "fight" to Adobe (which I would expect to be unnecessary as Adobe would probably be happy to support something that was in the ICC spec.)
The thing I think is strangest about all of this is that the discussions are only coming up NOW, much more than a decade after the ICC spec supported link profiles.
regards,
Steve
--
_______________________________________________
Do not post admin requests to the list. They will be ignored.
Colorsync-users mailing list (email@hidden)
Help/Unsubscribe/Update your Subscription:
This email sent to email@hidden