DIS Print Production & Prepress 2

Question 1

What is the purpose of 'color separation' in four-color offset printing?

Accepted Answer

Dividing a full-color image into individual CMYK channels so each can be imaged to a separate plate

Answer

Color separation produces four single-channel files—cyan, magenta, yellow, and black—each of which is used to expose a corresponding printing plate on a four-color press.

Question 2

What does GCR (Gray Component Replacement) accomplish in prepress color preparation?

Accepted Answer

Replacing equal CMY components that form neutral tones with black ink to reduce total ink coverage

Answer

GCR substitutes the equal amounts of cyan, magenta, and yellow that combine to make neutral grays with black ink, lowering total ink coverage, improving press stability, and reducing ink cost.

Question 3

What is the function of registration marks printed outside the trim area on press sheets?

Accepted Answer

Providing alignment targets so press operators can register all color plates to the same position

Answer

Registration marks appear identically on every color separation and allow operators to visually and mechanically align plates so all inks print in exact register.

Question 4

What is 'imposition' in a prepress and print production workflow?

Accepted Answer

Arranging multiple document pages on a press sheet so they read correctly after folding, cutting, and binding

Answer

Imposition layouts arrange pages on a press sheet in the correct sequence and orientation so that after folding and trimming the bound signatures, pages fall in the right order.

Question 5

How does stochastic (FM) screening differ from conventional AM halftone screening?

Accepted Answer

FM screening uses randomly placed dots of uniform size; AM screening uses regularly spaced dots of varying size

Answer

FM (frequency modulated) stochastic screening varies the placement of same-size dots randomly, eliminating moiré patterns and producing smoother gradients compared to AM screening.

(DIS) Digital Imaging Specialist Certification Practice Test

(DIS) Digital Imaging Specialist Certification Practice Test

DIS Print Production & Prepress 2