Median

This filter is most useful as a way to eliminate moire patterns. If your scanner does not have a descreen option, run this filter on your scans. This filter is very sensitive; so only use a low value for image correction. High values can be used to get an interesting softening effect. The filter examines the radius of a pixel for pixels of similar brightness. Any nonmatching pixels are discarded and replaced with the median brightness value of the searched pixels.

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