CMYK printing process for posters, tickets, and printed props — each color one separate pass. Matters for authentic period-correct signage on set.
In four-color separation, the image motif is divided into four color layers—Cyan, Magenta, Yellow, and Black (CMYK)—and each color is printed in a separate pass on paper or cardstock. On set, you primarily need this when you require authentic posters, movie posters within the film, old tickets, or printed props that are visible in close-ups or as set dressing. Each color channel is exposed and printed separately, leading to characteristic transitions and a very specific visual texture—you'll recognize this immediately when you place an original 1950s four-color poster next to a modern digital print.
The practical advantage for film production: this printing technique creates a grain and color separation that is immediately recognized as authentic in extreme close-ups or under specific lighting. If you need a scene set in a particular era—say, the 1960s or 1970s—and a poster is visible in the background, it makes a huge difference whether you use a modern printed motif or an actual four-color print. The halftone dots (the typical raster pattern) are clearly visible in four-color printing and immediately lend credibility to the set. For set dressing, product design, and graphic design in film, this is a visual hallmark of authenticity.
In editing and post-production, understanding this technique helps when you need to match VFX inserts or digitally created posters with authentic material. Many production designers therefore work with genuine four-color printing instead of pure digital prints—especially for films that deliberately utilize a vintage aesthetic. The print is more durable than inkjet, the colors are more stable, and they react differently under set lighting. Ensure your graphics department understands that four-color printing takes time—at least 2–3 weeks of advance planning to create the separations and pull multiple proofs. Particularly important: color management between the camera and the print must be correct, otherwise, you'll get completely different tones on location than planned.