[The original standard deviation and density range of the picture are printed on the terminal.]
.STANDARD DEVIATION FACTOR: 3
[This factor defines the bottom and top sided truncation
of the data. In the given case, all data that are smaller
than (MODE-3 * S.D.) and all data larger than (MODE+3 *
S.D) are replaced by the threshold values.]
.(1) BOTTOM (2) TOP (3) BOTH SIDES: 3
[Specify if you want one-sided or two-sided truncation.
The pixels with density higher than the ceiling will