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Originally Posted by CSflim
how was that done?
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in the original episode the panel went black because the crew interrupted its power. So the original clip has the reflection of Data beating on a uniform black surface.
They used a process called chromakey, in which the computer replaces a specific color with another video. They set the key color to the black of the panel.
Same technology used for the weather map on the evening news (except that's a blue or green chromakey).