Print Production & Prepress Flashcards

What key advantage does Computer-to-Plate (CTP) technology offer over traditional film-based platemaking?

Answer: It images plates directly from digital files, eliminating the intermediate film step and improving accuracy

CTP lasers expose printing plates directly from digital data, removing film output and contact exposure steps, which reduces time, cost, and registration error.

What is PostScript, and why is it significant in print production?

Answer: A device-independent page description language that mathematically describes text and graphics for consistent output on any compatible device

PostScript describes pages using mathematical operators rather than device-specific raster data, so any PostScript-compatible RIP or printer can render the document at its native resolution.

In offset lithography, what is the primary function of the blanket cylinder?

Answer: Transferring the inked image from the plate cylinder to the substrate

The rubber blanket cylinder accepts the inked image from the aluminum plate and then transfers (offsets) it to the paper, which is why the process is called offset lithography.

Which characteristic most precisely defines the PDF/X-1a specification?

Answer: All colors must be in CMYK or spot color only; no RGB, Lab, or device-independent color spaces are permitted

PDF/X-1a mandates that all colors be defined in CMYK or spot, fonts be fully embedded, and live transparency be flattened, making files fully self-contained and predictable for offset press output.

Flexographic printing is most commonly used for which category of substrates and products?

Answer: Flexible packaging, labels, and corrugated materials such as plastic film, foil, and cardboard

Flexography uses flexible photopolymer relief plates and fast-drying inks that adhere to non-porous surfaces, making it the dominant process for food packaging, shrink sleeves, and corrugated boxes.

What is the role of a color proof in the prepress production workflow?

Answer: Providing a reference sample that simulates the expected print result for approval before committing to a press run

A color proof—whether a contract hard proof or a certified soft proof—gives designers and clients a reliable preview of the finished print so corrections can be made before expensive press time begins.

What does LPI (lines per inch) measure in the context of halftone printing?

Answer: The frequency of the halftone screen, determining how fine or coarse the dot pattern appears in the printed image

LPI describes the density of halftone screen lines per inch; higher LPI values (e.g., 175 lpi for coated stock) produce finer, less visible dots and sharper tonal reproduction.