Create a filter

Filtering is a process in which each pixel value in a raster map is replaced with a new value. The new value is obtained by applying a certain function to each input pixel and its neighbourhood.

You can create your own linear filter. Linear filters use a linear combination of all pixels in a rectangle around the input pixel.

This dialog box appears:

when from the File menu of the Main window, you choose the Create Filter command, or
when you double-click the New Filter item in the Operation-list, or
when you click the create filter button in the dialog box of the Filter operation.

Dialog box options:

Filter name:	Type a new name for your linear filter.
Description:	Optionally, type a description for the filter. The description is visible on the status bar of the Main window when moving the mouse pointer over the filter in the Catalog.
Rows:	Type an odd value to define the number of rows for the filter.
Columns:	Type an odd value to define the number of columns for the filter.

After clicking the OK button, the Filter editor is opened.