A: 10-bit color depth prevents "color banding"—those ugly horizontal lines in the sky or dark gradients. Irreversible has lots of solid red and black surfaces; 10bit is superior to 8bit.
Dual audio options (typically original French with English/localized subtitles) irreversible 2002 dual 1080p upd
The film is structured in reverse chronological order, and the lighting changes drastically as the story progresses. A: 10-bit color depth prevents "color banding"—those ugly