Three-Strip Technicolor: The Wizard of Oz
From the mid 1930s to the early 1950s, most of the few color movies Hollywood produced were shot in Technicolor's three-strip process. A special camera photographed films like The Wizard of Oz (1939) by recording each primary color on a different strip of black-and-white film. The result was a beautiful, supersaturated color that looked both painterly and photographic.
The Wizard of Oz makes full use of the Technicolor palette, from the ruby slippers to the "horse of a different color." For the Blu-ray release, Warner Brothers has freshened up the Technicolor with a brand-new 8K (7680 by 4320) scan of the original negatives, bringing out details that I missed even in pristine 35mm prints--I'd never noticed before that Munchkinland was wet as if from a fresh rain. (Pay no attention to the restoration short among the extras; it's five years old and comes from a previous, 4K restoration.)
Republished with permission from PC World (view original version)