PLOT /SCALING

        [GREG2\]PLOT /SCALING Type [Low_cut High_cut]

    Defines the type of transfer function to be used. Type can be  LIN(EAR),
    LOG(ARITHMIC)  of  EQU(ALIZATION),  and the Low_cut and High_cut are the
    lowest and highest represented values respectively. The  default  "cuts"
    are the image extrema. The current cuts are stored in the variable array
    CURIMA%SCALE. The current scaling (as an integer code) is stored in  the
    variable  CURIMA%SCALING.  The  LOG transfer function computes the loga-
    rithm of the pixels values, so does not like negative or null pixels.

     The EQUalization scaling tries its best to put the same number of  pix-
    els in each slot of the color table, thus increasing immensely the visi-
    bility of low-contrast images. This scaling mode has problem (and  warns
    user)  when  a large number of pixels have exactly the same value (i.e.,
    no contrast at all). Beware that most "real" images  are  obtained  with
    receivers working with a small number (11 to 16) of bits, thus restrict-
    ing the range of available Real numbers in the data.

    The  SIC  variables  CURIMA%EQUAL%NLEV,   CURIMA%EQUAL%LEV   and   CURI-
    MA%EQUAL%HIST  contain the number of different levels computed in EQUAL-
    IZATION mode, the values of these levels, and the number  of  pixels  in
    each  level,  respectively. Useful to know which contour levels to draw,
    and necessary for the WEDGE command.