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Flashcards in Printing Standards & Specifications Deck (30):
0

What does SWOP stand for?

Specifications for web offset publications

1

What's does GRACol stand for ?

General requirements and applications for commercial offset lithography

2

What does SNAP stand for?

Specifications for newsprint advertising production

3

What is ISO 12647

1. The official international printing standard
2. Defines ink/paper colour, dot gain etc.
3. Universal basis for print specs (SWOP, GRACol, ICC etc.)

4

WhT Re Colorimetic Specifications?

Defined by characterization data sets
Must be tested yearly

5

What is densitomerty?

1. Measures ink quantity but not ink colour
2. Convenient for CMYK process control
3. Less useful for colour matching
4. Doesn't measure appearance

6

What is Colorimetry?

1. Measures ink colour precisely
2. Less convenient process control
3. Excellent for colour matching
4. Measures visual appearance

7

Colorimetry basics involve this formula

CIELab = numerical definition of human vision

8

For the CIELab:

Lowest L value = 0 (black)
Highest L value = 100 (white)

9

What is the unit of CIELab colour

Delta E

10

What does 0 delta E mean?

It means there is NO different in colour (only in a perfect world)

11

What delta E value = limit of visual perception

Less than 1.0

12

What delta E value = typical proof tolerance

Less than 2.0

13

What delta e = good press tolerance

Less than 5.0

14

Delta E is the..

Difference btwn colour on swatch to match colour on press sheet

15

SWOP is intended for

Web offset publications on coated paper

16

GRACol was developed for

Commercial sheetfed offset lithography

17

SNAP is intended for

Newspaper industry (including ads printed in newspaper)
Coldset newspaper printing

18

What is G7

New method for calibrating a press or proofer
Bases of both current SWOP11 and GRACol 7
Based on visual metrics
Brings photographic principles to press
Controls Gray balance and neutral tonality (which TVI doesn't)

19

G7 is named for...

G = gray scale
7 = seven ISO ink solids
Trade mark of IDEAlliance

20

Limitations ofmTVI calibration

1. Identical CMY TVI curves can produce different neutral contrast and/or gray balance
2. Doesn't control gray tonality b/c ignore 3-colour ink trap
4. CMY TVI curves don't control gray balance b/c they ignore ink trap, opacity,hue

21

How many scales does G7 calibration measure?

2 scales

1. K-only
2. Gray balance

22

By using look up tables (LUTs) G7 calibration controls....

Neutral contrast & gray balance

23

Benefits of G7 are...

1. Directly Controls neutral tonality & gray balance using same RIP curves as TVI
2. CMY gray scales measures visual affects 3-colour trap for precise gray tonality
3. CMY gray scale measures and controls the combined effects of ink trap, ink opacity and hue for precise gray balance

24

G7 ink =

ISO ink

25

G7 paper =

ISO paper

26

All G7- based printing methods share

1. Same gray balance & tonal contrast
2. Less need to convert files separated for another process

27

A specification is based on

A standard

28

IDEAAlluance does not make

Standards

29

IDEAlliance's mission is to

Promote & implement standards like ISO 12647-2
(And develop moods where needed)