Documentation on imsharp

Task: imsharp
Purpose: Sharpen an image
Categories: map analysis

     IMSHARP is a MIRIAD task which sharpens an image. No sub region can
     be selected, the whole image is processed. Masking information
     is properly processed though: if any of the associated pixels has 
     been masked out, so will be the corresponding pixel in the output 
     image.
     Other methods to sharpen images: use SMOOTH with norm=0.0 and
     divide the smoothed map by the original map using MATHS (unsharp
     masking). Also: Shift or rotate an image, and subtract it from
     the original. Good for (non)axysymmetric features resp.

Key: in
     The input image. No default.

Key: out
     The output image. No default.
     Note: Nasty things happen to 4D+ datasets.

Key: method
     Select the method to use to sharped an image.
     Currently only simple 2D laplacian derivatives.