The use of standard bluescreen techniques for doing matte shots of the birds proved to be unacceptable. The rapid movement of the birds, especially their wings, caused excessive blue fringing in the shots. It was determined that the sodium vapor process could be used to do the composites. The only studio in America that was equipped for this process was the Walt Disney studio. Ub Iwerks, who had become the world's leading expert on the sodium vapor process, was assigned to this production.

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