Colour Aim Points

Question 0

Conversion from RGB to CMYK is done via

Answer 0

A look up table (LUT)

Question 1

When converting RGB to CMYK you must take in the following factors

Answer 1

Dot gain
Ink limits
UCR
GCR
Gray balance

Question 2

Photoshop can be set to convert 2 diff ways

Answer 2

1. custom chosen attributes

2. Definition of ICC profiles

Question 3

What is the default profile used to convert RGB to CMYK

Answer 3

Older SWOP profiles

Question 4

swop is best used for converting images for sheetfed printing…T or F

Answer 4

FALSE. Swop is used for web offset printing therefor unsuitable for sheetfed printing

Question 5

Ink colours pallet in Photoshop will

Answer 5

Compensate for known deficiencies in common ink sets (I.e. ratio of CMY) for gray balance & indv colour correction

Question 6

Dot gain pallet in Photoshop

Answer 6

Specifies the dot gain for press and stock

Can simply be set to MT gain or fine tuned

Question 7

UCR Stands for

Answer 7

Under cover removal

Question 8

What does UCR do?

Answer 8

Removes CMY from neutrals and replaces with K
Black is important to image quality & must be controlled more tightly on press
Limits separation of colour and tone in SH

Question 9

If press can print high TIC

Answer 9

Avoid UCR

Question 10

GCR stands for

Answer 10

Gray component removal

Question 11

Unlike UCR, GCR affects

Answer 11

Colour components too

Question 12

GCR removes

Answer 12

The gray component from COLOUS & replaces with K

Question 13

In regards to GCR, K in normal separations will only appear

Answer 13

In neutral SH

Question 14

K in GCR will be apart of

Answer 14

ALL colours even in the HL

Question 15

How old is GCR compared to UCR

Answer 15

Relatively new

Question 16

What are the advantages of GCR

Answer 16

Faster make ready
Reduce ink costs
Better wet ink trapping
Easier to control consistency (only 2 colours used to control consistency)

Question 17

What are the disadvantages of GCR

Answer 17

Not widely accepted by press ppl
Black becomes major component of colour
Above 50% GCR extends into colours
Below 50% GCR affect similar to UCR
Too much GCR = causes subtle colour variation too be lost

Question 18

What is black generation

Answer 18

Used only with GCR

Determines point at which GCR begins based on relative gray values

Question 19

Ink optimization is

Answer 19

Software which controls the separation of RGB to CMYK or Re separation of CMYK to CMYK
Saves 17-27% ink

Question 20

What is black limit

Answer 20

Determines darkest possible value of black produced by Photoshop
Affects the SH
Leave at 100% unless total ink limit is set above 300%

Question 21

What is the UCA amount

Answer 21

Under colour addition
Adds CMY where black is present in a photo
Not desirable in offset printing