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Originally Posted by Henry_222
Why would the yellow being on the opposite side of the color wheel have any effect on purple glasses?
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Well, if there was a yellow line or target on a white or grey surface, viewing it through a purple filter would make the yellow black, and therefore very visible. A purple filter would be quite good for a sensor trying to optically detect the yellow paint.
Conversly, if you are trying to detect something against a yellow background, a purple filter would make the background appear black. Again, quite useful for an optical sensor.