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Hour 17. Using the Improvement Filters > Adding or Removing Noise

Adding or Removing Noise

The Noise filters have nothing to do with sound. The kind of noise we’re dealing with here is electronic noise. It’s displayed on a TV screen or computer monitor as a pattern of random dots, usually in color. It’s also called snow, and before we all got cable TV, it was common whenever you tried to tune in a TV station that was too far away.

Noise doesn’t sound like a useful tool, but rather something you’d like to get rid of. Three of the four Noise filters are, in fact, designed to remove noise. It’s fairly obvious from the names what Despeckle and Dust & Scratches are trying to remove, but what about Median? Median reduces noise by looking for individual pixels that are too bright or too dark, and changing them to the median brightness value of the pixels around them. Sometimes you don’t want to remove noise, but add it, and of course, that’s what the Add Noise filter is for.


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