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RE: Fingerprinting a Sheetfed Press

We are about to do a similar thing n our presses, both of which are two colour with plates provided by an AB Dick Digital Plate Maker (DPM). We also have a digital Konica C500 copier/printer together with a Fiery RIP. To support the Fiery we use the Fiery Profiler which is essentially the offering from GM One Eye.
 
We intend to simply follow the same route used on the digital 'press'.
 
First Calibrate the DPM.
Send a Patch/Test Sheet created by the profiler to the DPM create four plates
Print the Patch/Test Sheet
Measure the printed sheets and create a press profile.
 
Repeat the exercise using a Patch/Test Sheet for paper/stock profiling
Produce the plates and print on to a variety of stock for profiling.
Measure the prints and create stock profiles.
 
Perhaps not as complete as you would need to teach students, but for us more than adequate.
 
SWOP is a fairly 'good' general profile to adopt on a sheetfed press it works well. Albeit once profiled you will of course have your own (press profile) and be able to compare the two. Once again, with our Fiery Profiler we get a particularly good image file to allow such a direct comparison - before and after test sheet. A little easier to produce on a digital press but in your environment I guess time is far less important... (tongue in cheek of course) so it would be a useful and practical exercise on the litho press.
 
As an aside would you expect variations in the profile over time and if so what factors and how significant?
 
Regards
 
Peter Leyland

From: Matt Smolka [mailto:email@hidden]
Sent: 07 September 2005 01:46
To: email@hidden
Subject: Fingerprinting a Sheetfed Press

Fellow list-members,


One of the projects at Ryerson University's Graphic Communication Program is to design a special project in which students design and carryout their own testing of a printing process.


In light of this, I'm looking at fingerprinting our GTO52 2/c as well as our DI 4/c presses using M-Real coated and uncoated stocks. What would be the ideal method in going about this? IT8 target? GATF testform? Can anyone provide me with links to resources or testing procedures?


Ideally, he aim is for a neutral grey balance as well as target wet densities. Printing conditions are such that SWOP standards are used even though it is a sheetfed press. I'm thinking that maybe we should be using GRACOL standards for this test and implementing the use of these standards for the future, unless someone can suggest reasons to keep using SWOP.


Data gathered here would be used to generate dot gain compensation curves for both uncoated and coated stocks for our premedia labs, i.e. Photoshop curves. The intent here is to produce a press sheet that can be profiled and used as a curve template for our Apogee RIP/Meta Dimension RIP as well as being used to "soft-proof" documents on lab workstations (which are profiled every week).


Thanks in advance for the insight.


Matt Smolka

Designer | Photographer | Consultant

v: 905.862.0800

c: 416.888.0919

e: email@hidden


Ryerson University

School of Graphic Communications Management,

Department of Student Services &

The Eyeopener

125 Bond St.Toronto, ON M5B 1Y2


Catalyst Productions, Ltd.

8280 Concession Rd 4

Uxbridge, ON L9P 1R1

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