DIS Print Production & Prepress

Question 1

In prepress production, what is the primary purpose of 'trapping'?

Accepted Answer

To prevent white gaps at color boundaries caused by misregistration on press

Answer

Trapping adds slight overlaps between adjacent colors so that minor press misregistration does not create visible white gaps between color areas.

Question 2

What does a Raster Image Processor (RIP) do in a print production workflow?

Accepted Answer

Converts vector and image data into raster dot patterns for output devices

Answer

A RIP interprets page description languages (PostScript, PDF) and converts all content into the raster dot patterns that imagesetters, platesetters, and digital presses can reproduce.

Question 3

In offset lithography, what is 'dot gain'?

Accepted Answer

The spreading of ink dots on the substrate that makes halftone dots appear larger than designed

Answer

Dot gain occurs when ink spreads as it transfers from plate to blanket to paper, causing halftone dots to physically enlarge and making prints appear darker than intended.

Question 4

What is the typical total ink limit (TIL) for coated paper in CMYK offset printing?

Accepted Answer

320–340%

Answer

Coated stock can accept roughly 320–340% total ink coverage; exceeding this risks slow drying, setoff, and paper damage even though four channels theoretically allow 400%.

Question 5

What is 'overprinting' in prepress, as opposed to a knockout?

Accepted Answer

Printing one ink layer directly on top of another without removing the underlying color

Answer

Overprinting allows an ink (commonly black text) to print over a background color rather than cutting a white hole (knockout), preventing gaps if registration shifts slightly.

(DIS) Digital Imaging Specialist Certification Practice Test

(DIS) Digital Imaging Specialist Certification Practice Test

DIS Print Production & Prepress