1. Ragy Isaac Dennis Cheeseman
The Metro Users 2014
Ragy Isaac
Dennis Cheeseman

2. Is This Your Make-ready?
Audit your process!

3. Quality Steps Calibrate:
Prepress: line-screen, profile, TVI, preset, etc.
plate-room
Press
Consumable
Human factor

4. Agenda Same digital dot Variability on plate
“To rub it or not to rub it” that is the question!

5. Introduction SNAP Profile should be your standard RGB to CMYK
Depends on consistent dot value
SNAP changed the SNAP certification program this year to alert printers to issues with dot gain/loss

6. Facts No ISO standard for Litho plates
CTP plates loose dot values relatively quickly on press
Variation is high in mid tones
Gray bars are a gauge for controlling solid ink densities

7. Solutions SNAP is attempting to create a standard thus to ISO
Current rub back procedure:
Is a rough but quick methods
Need to be more scientific
Need your help, we will provide the know how

8. Evaluate the Plate-room
Less variability for the same input
Highly Variable
Precise
Accurate and Precise
Needs Linearization

9. Image-setter Less variability for the same input
To evaluate a machine, eliminate human

10. Magnified Cyan TVI Form
I am going to ask you to measure every spot inside the square with a CCD plate reader for the plates and densitometer/spectrophotometer for the paper.
The CCD dot data for the 40% example will not all be the same: light sensitive coating, laser wave length, type of image-setter capstan or drum, …etc 10

11. Image-setter Test Form
Each dot % will have 32 values
40% dot example data:
8 for each of the CMYK

12. Image-setter Test Form
Each dot % will have 32 values
40% dot example data:
38.4, 39.9, 39.8, 40.6, 39.5, 40.8, 39.7, 39.8, 39.7, 39.9, 40.1, 40.9, 41.2, 40, 40.4, 40, 39.5, 39.1, 41.5, 39.4, 40.4, 40.9, 41.1, 41.1, 40.1, 42.3, 40.1, 40.7, 40.9, 41, 40.7, 41.1
Which value is the right value?
Values range between 38.4 & 42.3
Max – min = 3.9

13. RIP, Image-setter & Processor

14. Dot Loss! “To rub it or not to rub it” that is the question!
What do you currently do?

15. Recommendation Run the previous test: With or Without rubbing
Print on press
Collect
printed samples
the plates
Measure the plates

16. SNAP’s Free Offer You provide the data and instructions
SNAP will tell you how to setup your image-setter and dot gain