RE: Images and TAC values
RE: Images and TAC values
- Subject: RE: Images and TAC values
- From: Roger Breton <email@hidden>
- Date: Fri, 12 Dec 2014 21:12:39 -0500
This is an interesting conversation.
First, I want to salute Martin's original suggestion to do a Profile to Profile conversion or Proofing Setup in order to trigger a Gamut Warning. I ought to try this trick but, I suspect it won't be of much help for me :(
Second, I agree this new "Viewing option" should be located under the View menu. That's a no brainer.
Third, I often run in exceeding the prescribed TIL when editing images myself. So I can vouch to the usefulness of such a viewing option in Photoshop. I remember, once, using the Curves tool, to satisfy the craving for a client for contrast; by pulling the black point in from the right, on a CMYK image, all of a sudden, the darkest tones of the image, that were already well mapped to a max of 300%, became 310%, 320%, 340% and so on. And I did not pay attention to the fact that the extra contrast I was witnessing was achieved at the expense of overstepping the 300% boundary. By the time I realize my "oversight" it was too late. Needless to say I didn't do the same mistake twice but suffice to say that, had I had access to a "TIL Preview" somewhere, in Photoshop, a mode I could have turned on, à la Gamut Warning, I would have seen the mistake I was making. This could have taken the form of red pixels overlaid on the image, indicating an excess of a selected maximum TIL. Then, having been "warned" that way by Photoshop, it would have been a matter of deciding which pixels to push closer to the 300% boundary.
No offense, Martin, but in this case, I tend to think that, a P2P proofing setup is a "poor man" TIL Preview. And I fail to see this as a feature that could be tied to ICC workflow? I tend to see it as a straightforward, mechanical kind of "Device CMYK" dumb interface. Flip it on, flip in off. You need it? You activate it. You don't? You hide it. No mess, no fuss. Instant gratification. To me, it has nothing to do with Gamut Warning. But, again, no offense and I'll gladly give your trick a try until Adobe comes up with an update with that viewing option, in a future update.
Best / Roger
-----Original Message-----
From: colorsync-users-bounces+graxx=email@hidden [mailto:colorsync-users-bounces+graxx=email@hidden] On Behalf Of Ben Goren
Sent: 12 décembre 2014 10:11
To: ColorSync List
Subject: Re: Images and TAC values
On Dec 12, 2014, at 7:50 AM, Andrew Rodney <email@hidden> wrote:
> The Gamut warning isn’t going to help, for one, it’s quite buggy.
Seems to me that this is something that shouldn't be all that much of a challenge, and that you could probably create an action that would run quickly that would do the job. Basically, convert the image to the destination profile and then select all pixels with a value of either 255 or 0 in any one of the channels.
An action is obviously much less than ideal; too slow and clunky. But if I'm right and it would be easy to create such an action, it should be equally easy to code it into the application itself.
b&
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