uim.filter is an example filter definitionfile.
The layout of a filter definitionfile is:
divider
width height
field field...
field ...
...
For example:
1407 divide by 1407 after multiplication 3 3 filter has 3 columns and 3 rows 128 128 128 128 256 128 multiply the current pixel by 256 and the 128 128 255 pixels around it by 128/255
