To Use the Median Filter on a Selected Image

1. Click Raster menu Image ProcessingConvolve.
2. Click Smoothing Filters.
3. Click Expand All to expand the filter list.
4. Click Median Filter.
5. Click Run Filter to filter the image(s).
6. Enter a filter (or matrix) size. This filter uses a matrix for smoothing the pixels. For example, a filter size of 3 would filter each pixel by averaging the values of the 8 surrounding pixels.
   Note: The filter size must be an odd number.
7. Click OK to apply the filter.