SU -- Image data stretching utility
   SU INI name type unit <keywords>
   SU MAKE name inlo inhi britlo brithi
   SU LIST string
   SU TABLE name
Parameters:
   INI | initializes the stretch table defining the type of calibration,
         calibration units and initial breakpoint settings; must be done
         for making a new stretch table
   MAKE | enters breakpoints in the table using brightness levels
   LIST | lists the stretch tables saved on the workstation (def)
   TABLE | lists the breakpoints stored in a stretch table
   name | name of stretch table; 8 characters maximum
   string | list only stretch tables beginning with this character string
   type | calibration type for input table: AAA, GMS, GVAR, MSAT, QTIR,
          TIRO, VAS, VISR, WSI (def=use on any calibration type)
   unit | calibration units: RAW, BRIT, RAD, TEMP, ALB or user-defined
          units; use command IMGPROBE or D to list available units for
          the image (def=BRIT)
   inlo | low value of the breakpoint for input values; specify in units
          input with the 'unit' parameter
   inhi | high value of the breakpoint for input values; specify in units
          input with the 'unit' parameter
   britlo | low values of the breakpoints for output brightness values;
            the range is 0-255
   brithi | high values of the breakpoints for output brightness values;
            the range is 0-255
Keywords:
   BAND= | band number for input data calibration type (def=all bands)
   RANGE=min max | minimum and maximum values of the input data, the
                   range is 0-255
Remarks:
   Use command SU to make the tables specified with keyword SU in the
   IMGDISP command.  SU sets the tables to stretch raw, radiance,
   temperature, albedo or brightness values (depending on the calibration)
   to user-defined brightness values.  Then you can use command EU to
   color the brightness ranges corresponding to the new values.
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