Help for STRETCHF

    STRETCHF is a VICAR application program which changes the point by point 
intensity of an image by generating a transfer function on the domain of
intensity values.  It is similar to the program STRETCH, but is designed to
accept FULLWORD (integer*4) input. Nine types of stretches are available. 
These are:

    COMP,LINEAR,CONTOUR,ALARM,GAMMA,TABLE,ITABLE,PSTRETCH,FUNCTION 

     The input image must be fullword. The output image will also be fullword.
The user must specify the DN range of the data by using the DNMIN and DNMAX 
parameters.


     An optional linear post stretch may be performed following the initial 
stretch. This post stretch will take the output image DN values ranging from 
DNMIN to DNMAX to a user specified DN range. This post stretch does not require
a separate pass through the data. Instead, the initial stretch and the post
stretch are incorporated in a single look-up table which is then used to process
the input data.
 RESTRICTIONS:

          1. Only one of the nine types of stretches
             available may be specified in a single execution.
          2. Input image must be in either fullword format.
          3. If a post-stretch is requested the values
             specified must be in the range DNMIN to DNMAX.

EXECUTION:

   The following is the execution statement for STRETCH:
          STRETCH  INP  OUT  PARAMS
where INP, OUT, and PARAMS are parameters discussed in their
respective parameter section in TUTOR mode.