Re: MultiProfiler question
Re: MultiProfiler question
- Subject: Re: MultiProfiler question
- From: MARK SEGAL <email@hidden>
- Date: Fri, 07 Sep 2012 11:06:45 -0700 (PDT)
The fundamental problem is that LR only reads RGB profiles. A set of RGB profiles is needed that would replicate the characteristics of the Blurb papers, unless Adobe finds a way of getting LR to read CMYK profiles, in which case of course the onus would again be on Blurb to create relevant profiles we could use. Adobe and Blurb need to be "encouraged" to resolve this set of issues.
Mark
________________________________
From: Terence Wyse <email@hidden>
To: 'colorsync-users?lists.apple.com' List <email@hidden>
Sent: Thursday, September 6, 2012 2:30:24 PM
Subject: Re: MultiProfiler question
On Sep 6, 2012, at 2:13 PM, Andrew Rodney <email@hidden> wrote:
> Why they changed the papers isn't my immediate concern but rather what they are doing to "calibrated the printers with our current ICC profiles, so there’s no need for you to do anything on your end" process.
>
> There were four or so papers I measured, all different. One supplied profile. Now there is a newer paper and they are doing what to the printers or profile?
I think it's obvious that they're probably running HP Indigos or iGens or something and are simply using their respective RIPs built-in color management engine. I've done a fair amount of Indigos and it's pretty straightforward to profile these presses and then set up the CM engine where you spec GRACoL (or whatever) as the CMYK source along with RGB profiles and the rest and then insert the press/paper-specific profile as the output. The only problem with Indigos (it's been few months so maybe I don't have this exactly right) is that you can only specify a single global rendering intent for CMYK and RGB.....if it were me, I'd want RelCol+BPC for CMYK and Perceptual for RGB. The other not-so-subtle detail is how they would handle embedded profiles. I would hope they would honor ALL embedded profiles, including CMYK, but I'm not so sure. I'm sure the folks at Blurb are smarter than this(!)...but I still find to many owners/users of digital presses that
consider any other profile other than the one THEY specify as the source to be "wrong" or "bad"...so they typically tell the CM engine to ignore embedded profiles and assign their own source profiles whatever's coming in to the system.
Anyway, my point is that it's not necessarily a "bad thing" that they are holding their custom press/paper profiles close to the vest and telling folks to simply use GRACoL as their source/assumed CMYK profile and let their system handle the specific press/paper conversion....that's really how it should work. Most of these systems require several-times-daily calibration/linearization and I assume these folks are also updating their ICC profiles on a periodic basis. In my opinion it would be a nightmare trying to keep a knowledgeable or not-so knowledgeable user base up to date with their ICC profile du jour.
Terry
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