Colour Seperation

Question 0

How does the printing process produce colour

Answer 0

Using the CMYK laid down in overlapping g halftone pattern

Question 1

Define colour separation

Answer 1

Process of reproducing an image colour into a process colour (CMYK) or a set of spot colour in prep for print process

Question 2

What is needed to convert continuous tone images to half tone

Answer 2

1. An input device (camera, enlarger,)
2. Colour filters & masks
3. Halftone screens

Question 3

What kind of filters are used to create CMYK for negative film?

Answer 3

R,G,B filters used

Relied on DROP & HOLD method

Question 4

On a negative film, a filter:

Answer 4

Drops it’s own colour on the negative

Black created using all 3 filters

Question 5

Factors that could affect the quality of colour separation

Answer 5

Physical properties of image capture system
Image recording distortions
Image processing compromises
Output recording choices

Question 6

Describe a rotary drum scanner

Answer 6

Rotational speed 1,200 rpm

Highest res up to 10,000 LPI

Question 7

First. Version if rotary drum scanner

Answer 7

Kodak 1930

Question 8

Flat bed scanners are also known as

Answer 8

Charged coupled devices (CCD)

Question 9

Digital camera characteristics

Answer 9

1. Film & transparency originals for scanning replaces by CCD or CMOS sensor
2. Is essentially a live scanner
3. Img capture & colour sep are done in 1 step

Question 10

What are CMOS

Answer 10

Complementary metal oxide semiconductor

Question 11

What do CMOS do?

Answer 11

Both convert light into electric charge & process it into electronic signals

Question 12

A CMOS sensor often includes

Answer 12

Noise correction

Question 13

What are the 3 classifications of digital cameras today

Answer 13

1. Point & shoot
2. Digital single reflex
3. Professional

Question 14

How many megapixels do point & shoot cameras have

Answer 14

Up to 8/9 megapixels

Question 15

How many megapixels do digital single reflex cameras have

Answer 15

Up to 12 megapixels

Question 16

How many megapixels do professional cameras have

Answer 16

Up to 30/40 megapixels

Question 17

What are handheld CCD cameras used for

Answer 17

Outdoor, action portraits

Question 18

What are studio type cameras used for

Answer 18

Still life studio applications

Question 19

Linear array CCDs are used with

Answer 19

Studio type cameras

Question 20

Single area CCDs or 3CCD split-beam system are used with

Answer 20

Hand held CCD camera

Question 21

In an ideal word, CMY would be

Answer 21

Black

Question 22

In the real world CMY =

Answer 22

Brown

Question 23

How is black generated

Answer 23

From RGB data

Question 24

When is black ONLY used

Answer 24

In neutral shadows to increase shadow density and detail

Question 25

T or F….black contributes to colour not nuetrals

Answer 25

FALSE. Black doesn’t contribute to colour. ONLY neutrals

Question 26

What is skeleton black

Answer 26

Black only in neutral shadow areas
Adds detail & density to SH
MT = 10% K to SH= 70% K

Question 27

What is full black

Answer 27

Black extends from shadow to MT to HL

Question 28

To compensate for the fact that inks aren’t pure & that colour isn’t perfect we:

Answer 28

1. Adjust grey balance

2. colour correction

Question 29

Converting RGB to CMYK involves

Answer 29

Tone reproduction
Colour correction
Grey balance