This short scene of the explosion on the Death Star and the Stormtroopers hitting the walls, was very problematic, and took a few hours to fix:
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Normal speed:
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http://www.dailymotion.com/video/k3VyPuOPxGlcelc556N
Slow motion (2fps):
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http://www.dailymotion.com/video/k477mZbOP3r6F6c55hM
There were many other scenes with noise, dirt, and scratches, Even the explosions had many areas to clean. Reel 6 was the most difficult and time consuming one to clean up, even without replacement shots.
Team Negative1