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From: Lee Badham <email@hidden>
Subject: ISO Print Sequence
To: email@hidden
Message-ID: <email@hidden">email@hidden>
Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed

Hi,
I went to a printer the other day to set them up to run to ISO
12647-2. The ISO standard print sequence is CMY, with black either
first or last. They were printing MCYK, but could give no reason to
do so, other than they had heard that it was 'better'. The ISO
document gives no indication WHY CMY should be used. A google search
online only gave a brief explanation saying that Green suffer only a
little using CMY, but reds suffer alot using MCY. No reason was given
and I couldn't understand why the first and third inks would be the
problem.

Obviously to match a proof CMY must be used (They are proofing to ISO
Coated), but other that that I didn't know.

Hope someone can help.

Lee

Hi Lee

There has been a lot of discussion on print sequence at the UK TC130 Technical Advisory Group meetings and on the Printing Across Borders (PAB) Forum. It seems that many sheetded printers in the UK use MCY because of possible trapping problems with M being laid down on top of C, which might cause a mottling in blue-violets. May also be caused by the paper stock. Some printers I have spoken to say it may be a problem on only a very small percentage of jobs. Some don't want to change. I believe if you don't use KCMY or CMYK you are not strictly ISO 128467-2 compliant. Ideally if you use another sequence you should profile to that, and use the profile for image conversions and hard and soft proofing, but that is hardly likely to happen.

Cheers

Phil Cruse

Graphic Quality Consultancy

E: email@hidden

http://www.colourphil.co.uk