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Widescreen
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This creates editorial problems because cuts on entrances and exits are timed correctly for one version but not the other. Matching problems occur because 16x9 over-shoulder shots look like dirty singles in 4:3, etc.
After a lot of thinking and testing, Paramount Studios came up with the "Common Sides Process" to deal with this problem. The technique uses the entire 4:3 image and extracts the 16:9 image using vertical repositioning. Approximately 25% of the picture image is lost using either method but common sides produces a compromise that better supports the integrity of the edits and composition.
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Tests have shown that with this method there's a single vertical reposition that will work for the vast majority of shots. Once this position has been set, only about 10% of the shots need to be altered further for better framing.