Median Blur

Median Blur is similar in implementation to the regular blur. However, instead of simply averaging the surrounding pixels in order to get a new value, this filter uses the fact that the pixel values of an error in data are probably very different from the surrounding ‘good’ pixel values. Therefore, if we take each pixel in the square area around our current center pixel, and somehow sort the values, the error should be in one end of the sorted list.

To use the Median Blur filter:

Choose Filters > Blur > Median Blur