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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