FILE
Specifies the name of the file to be processed.
DBIC
Specifies the input channel or layer to be filtered.
DBOC
Specifies the output channel(s) or layer(s) to receive the output results.
The output channel or layer can be the same as the input channel or layer.
Only the area under the mask is processed; if no mask is specified, FPR filters the entire channel.
FLSZ
Optionally specifies the horizontal and vertical dimensions of the filter, in pixel units. Acceptable values are odd integers from 1 to 33, inclusively. The filter need not be square. Minimum filter sizes are 1x3 or 3x1; the default size is 3x3.
layer