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This is the most important word in the entire string. To understand "Open Matte," you must understand how films were projected in the 1980s. The Terminator 1984 Open Matte 1080p WEB-DL DDP...
Theatrical The Terminator was shot on 35mm film. The standard theatrical aspect ratio was 1.85:1 (widescreen). To achieve this, the film was shot using a spherical lens on a 4-perf 35mm negative, which naturally captures a "full frame" ratio of roughly 1.33:1 (the old square TV shape). During theatrical printing, the top and bottom of that image were physically masked (or matted) to crop it down to 1.85:1. When verifying you have the correct file, look
An Open Matte version removes that theatrical mask. It reveals the entire exposed negative area—the "open" full frame. For The Terminator, this means you see significantly more vertical information than any theatrical release. The standard theatrical aspect ratio was 1
Why does this matter? In scenes like Kyle Reese hiding in the alley or the Tech Noir shootout, an Open Matte presentation reveals details above actors' heads and below their chins that were intended to be cropped out. Sometimes, you see boom mics or studio ceilings; other times, you simply get a more immersive, compositionally different experience. For purists, it's a historical artifact. For fans, it's a new way to watch a 40-year-old film.
This is the most distinct part of the file name.