Re: Cross rendering question
Re: Cross rendering question
- Subject: Re: Cross rendering question
- From: Steve Upton <email@hidden>
- Date: Mon, 27 Jun 2005 21:08:28 -0700
At 5:03 PM -0700 6/27/05, Nathan Duran wrote:
>
>Assuming you mean you're using "Assign Profile..." here, this sounds like a
>very bad idea. You're essentially telling Photoshop that this printer was
>responsible for creating the image that is already on your computer, when in
>fact it had nothing to do with it whatsoever. Assigning is generally
>something you do with input profiles, not output.
>
>When you say you've tried Photoshop's soft proofing options and got the same
>results, what exactly did you do? You should be able to print from the
>proofing space to your in-house printer's space and get a decent match.
the situation in which you assign a known profile to a file without regard to the source of the file is when you are proofing and the file is in the final device model (CMYK typically)
So what Dennis was doing make sense. It might have been a little unusual to assign the profile to the file rather than proof with "preserve color numbers" but it is a valid maneuver.
<Dennis>
>I've been working on building a profile of a proofer at one of the prepress shops our clients deal with and am running into difficulty making cross rendered prints that match their proof. (We are an ad agency working on entertainment advertising.)
>
>Here's what I've done: Sent them a test image (one half of the page is the PhotoDisc image and the other is the i1CMYK 1.1 target) which they printed. Then I made a profile of their proofer, (with an EyeOne and i1Match 3.0), and assigned this profile to the test image in PS. I saw a good match on screen to their proof, but when I tried to make a cross-rendered print on one of our in-house printers there was not a good match.
so far so good. It seems like you followed a good path and I commend you for putting an image on the same page as the profiling target.
>In general the proof supplied by the vendor had a warm/yellow cast in particular to the gray scale as well as to the print overall. The cross-rendered prints I made all looked too blue, but when I tried using Absolute Colorimetric to get it to match the paper white of the proof the whites were way too yellow/dull looking.
the first thing that comes to mind is the relative paper colors. Is the inkjet paper bluer than the proof paper? (most of the time it is) The next thing is your lighting. If your lighting isn't controlled then you're in a tough spot and UV brighteners in the paper will also make things worse...
>I've done this successfully with other vendors and get a good screen to print match using the profiles I've made for the in-house printers in general. So I have confidence in the in-house part of the equation.
>
>And the formula I followed for cross rendering is pretty simple - take the test image, assign the new profile (good match on screen), then in PS CS2's Print with Preview choose the profile for the in-house printer and print to that device. I've tried both Relative Colorimetric and Absolute Colorimetric intents. The Relative Colorimetric conversions look too blue and the Absolute ones too dull and yellow. I've also tried CS2's proofing options with the same results.
yeah, overall it seems like this should work. I think it might be paper color, lighting and UV...
Bruce's idea of trimming paper edges is also wise for the abs col proofing. Even if you think it looks like hell you should give it a try. This is one of the reasons that paper white sim on screen in Photoshop doesn't work well as the surround graphics & UI don't get altered and they're much tougher to trim off (although hiding them helps a lot)
Regards,
Steve
________________________________________________________________________
o Steve Upton CHROMiX www.chromix.com
o (hueman) 866.CHROMiX
o email@hidden 206.985.6837
o ColorGear ColorThink ColorValet ColorSmarts ProfileCentral
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