To apply a grid filter:
- On the RASTER tab, in the Operations group, click Raster Operations and then click the Filter button to open the Filter dialog box.
- Select a classified raster from the Input File drop-down list.
- Select Classified Filter from the Select Category drop-down list.
- Enter the number of cells of region in the Minimum Region Area box. The value must be between 2 to 1000 cells.
- In the Output File box enter the name you want to specify for your output file. Click to browse to the location in your computer to save the output file and select the required output file format.
- Click Process button to perform the operation.