Hi,
Well, this has turned out to be quite a thread with shifts of emphasis.
Lou, Patrick, Donald & Zipper,
You may all be interested to read the comments below from someone who has intensive knowledge of magazine and newspaper workflow. I'm still trying to understand the implications.
Lou, whatever happens don't get heavily involved in the colour management process on this occasion as I'm sure that there are others in the process that could and should take over from you. Mind you, perhaps you should print off the images and show other parties as collateral for the work that you're about to do. Good luck! Here's the script:
Magazine & Newsprint Workflow
This workflow begins AFTER all editing processes are complete. If required, upres RGB file in 10% increments to ACTUAL size and 300ppi for magazine, ACTUAL size and 180ppi for newsprint. Then, convert RGB file to CMYK, or Greyscale for B&W image. Make sure that you have setup appropriate printers’ RIP in CMYK/Greyscale setup, or use Photoshop’s’ default SWOP, newsprint or EuroSwop settings if specific dot gain, UCR/GCR and ink limit variants are not available.
Go to SELECTIVE COLOR and reduce Magenta in BLUE by 40%, and in CYAN by 20%. This will prevent RGB blue from turning purplish in CMYK. SAVE as TIF, using IBM PC byte order. (Almost all MACs, except for very old systems, can read IBM PC byte order, but it is not so the other way around). NO COMPRESSION.
Have a Kodak Approval Proof made from this CMYK/greyscale tif file at the line screen of the magazine (i.e., 133, 150, etc.) or newsprint (i.e., 75, 85, etc.), on exact or similar paper, in actual size. Send this approval proof with CMYK/greyscale tiff file. DO NOT SEND desktop inkjet, continuous tone, or other types of prints for reference. I advise using only a service bureau with either the Kodak Approval Proofer or the Polaroid’s PolaProof.
If working with actual printer, get his “setup”, make a custom CMYK and/or Greyscale setup, and CONVERT to CMYK using this setup. If a spirit of cooperation exists, ask for a contract proof. If not, supply printer with Kodak Approval proof in conjunction with TIF file.
Lastly, all time and services, including cost of Kodak Approval proof, are billable items, and should be included on invoice in the same manner that you formerly included film/processing, scanning, couriers, etc. If printers respect anything, it’s the Kodak Approval.
DO NOT transfer unzipped data files by email. Send in binary mode by ftp, or by CD/DVD and courier, or, as last resort, use WinZip or stuffit and send by email.
AVOID SENDING ANY RGB FILES TO CLIENTS. To do so will allow your images to fall to the whims and subjective interpretations of others, including the printer. If you are going to burn CD, make sure it is in ISO Level 1, with limit to file names of 8 + 3. This will ensure true cross platform compatibility. For additional digital advertising standards, see
http://www.ddap.org/ .
Hope this is of interest and a contribution in some way.
Best regards,
Phil
The worst that has happened to me is having photos and spot color
go from vibrant to blah, when being converted from RGB to CMYK.
Fortunately everyone is so used to printed material, we mentally
compensate for the smaller CMYK color gamut. We ooh and ahh over
pictures that would look dull compared with seeing it on screen.
(Not to mention the big difference between transmissive and
reflective color...)
Problems such as you mention, about color shift depending on Mac
vs. PC or JPEG-CMYK vs. TIFF-CMYK, are why I believe the printer
should handle this for photographers like Lou who are non-experts.
ZipperZ's answer indicates he does catalog photography for a
living. As a pro working on pictures for printed output, he should
know about color gamut (RGB/CMYK) issues and yes, he should handle
his own pre-press to get the results he wants.
I also wonder whether ZipperZ has run into such a dramatic color
shift before, and whether JPEG-CMYK is more "stable" in color than
TIFF-CMYK. My guess on the latter is that there should be no
difference.
-- Patrick
In my experience the printer will have a Mac. Our photographer
probably has a PC. And we know there are a lot of different flavors
of tif files. And at some point the printer will probably save the
file in a CMYK format.
In my experience a potential nasty issue is that there can be a
huge color shift when saving RGB tifs which originate on a Windows
machine in CMYK from a Mac (probably vice versa but I've never gone
that way). I think this is due to the fact that the OS's expect the
rgb tuple to be in different orders.
I've never seen this problem with JPG files, though it could happen
I suppose. So unless I'm sure the printer will use RGB I prefer
using JPG files rather than Tiffs.
Have either of you ever encountered this?
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