To Use Bitonal Filters for a Selected Image

1. Click Raster menu Image ProcessingBitonal Filters.

   The following prompt appears:

   Press Enter for entire image or specify sub-region option [Existing/Clip region/Window/Polygon]:

2. Do one of the following:
   • Press Enter to use the filter on the entire image.
   • Enter e, then click a closed vector entity to use an existing entity to define the region.
   • Enter c to use an existing image clip.
   • Enter w, then enter two points to define a rectangular sub-region.
   • Enter p, then enter several points to define a polygonal sub-region.

   The Bitonal Filters dialog box is displayed.

3. Choose the Filter Type you would like to run on your image.
4. Choose the Number of Passes.

   For example, a pass value of 3 means running the operation 3 times.

5. Choose the Direction(s) in which you would like the filter to run.
6. Click OK to apply the filter.