`void rescale(float **pic, int pdim, float rescale)`

This function is used to rescale and threshold TF maps so that the
pixel values lie between zero and unity. The routine simply divides
each pixel by the argument rescale and sets any value greater than
unity to unity. Since the TF maps contain noise, it is possible for
the pixels to attain values which are much higher than the average.
To avoid losing information the argument rescale should be obtained by
averaging the maximum pixel value in a large number of maps.
The routine `compute_scalefactor()` can be used for this purpose.
The arguments are:

`float **pic`: Input/Output. The pointer to the TF map.`int pdim`: Input. The size of the TF map.`float rescale`: Input. The factor by which to divide each pixel of the TF map.

Author: R. Balasubramanian, bala@chandra.phys.uwm.edu

Bruce Allen 2000-11-19