chroma key
柯林斯词典
1. N (in colour television) a special effect in which a coloured background can be eliminated and a different background substituted (彩色电视机)色度键 (Also called colour separation overlay)
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1. N (in colour television) a special effect in which a coloured background can be eliminated and a different background substituted (彩色电视机)色度键 (Also called colour separation overlay)