Level 2 Help for HSTRETCH

INP

          INP=A          input image.


OUT

          OUT=B          output image.
                         files are halfword.


SIZE

          Image Size


SL

Starting Line


SS

Starting Sample


NL

Number of Lines


NS

Number of Samples


VALUE

          VALUE=I        The DN value "I" is used to specify 
                         the  primary DN value of the binary 
                         mask.   All  values listed  in  the 
                         QTABLE  list  will be stretched  to 
                         "I" DN.


BVALUE

          BVALUE=J       The Dn value "J" is used to specify 
                         the  background  Dn  value  of  the 
                         binary mask.  All values not listed 
                         in   the   QTABLE  list   will   be 
                         stretched to "J" DN if BVALUE is
                         specified; otherwise the values are
                         not changed.


QTABLE

          QTABLE=        The  QTABLE  keyword  is  used   to 
         (N1,N2,         denote  a list of DN values "N1  to 
          N3,...         Nn"  which  are to be stretched  to 
          Nn)            the  primary  DN  value  "I"   (see 
                         VALUE).   The sequence of DN values 
                         is  not restricted to any numerical 
                         order.   All values not listed with 
                         QTABLE  will  be stretched  to  the 
                         background BVALUE if specified, or
                         unchanged if BVALUE is defaulted.


TABLE

          TABLE=         The TABLE keyword is used to denote 
         (01,N1,         all  input values "01 to 0n" to  be 
          02,N2          stretched  to corresponding  output 
          ...            values "N1 to Nn".  Data is entered 
          01,N1          as pairs 01,N1 where 01 denotes  an 
          ...            old  DN value to be stretched to  a 
          On,Nn)         new  DN value,  N1.   ONLY THOSE DN 
                         VALUES  LISTED WILL  BE  STRETCHED, 
                         AND  ALL  VALUES  NOT  LISTED  WILL 
                         REMAIN  UNCHANGED.   The  order  of 
                         stretch   pairs   01,N1   are   not 
                         restricted    to    any    specific 
                         numerical order.