One technique used in filming Pete’s Dragon (1977) was a sodium vapor process(occasionally referred

One technique used in filming Pete’s Dragon (1977) was a sodium vapor process (occasionally referred to as yellowscreen). This process combined the foreground (the actors filmed in front of a white screen), an animated middle ground (containing Elliott), and the filmed background into one shot. (In the gif above, you can see that subtle, greenscreen-like outline around Pete against the background. Click here to read a much more detailed explanation of the yellowscreen process.) -- source link

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