IMAGE

        IMAGE [Filename] [/PLANE  I1  I2]  [/SUBSET  Imin  Imax  Jmin  Jmax]
    [/WRITE]

    Read the GDF map Filename. The default  image  extension  is  .GDF  This
    command  defines the image found in given file as the new current image.
    Projection, system and extremas  are  also  defined  if  needed.  Unless
    options  are  present,  the  first  plane  of  the image becomes the new
    Regular Grid array in GreG.

    The /PLANE I1 I2 option  allows  to  define  part  of  a  more  than  2-
    Dimensional  image  as the regular grid array. A file name should not be
    specified if you want to select a new plane in the current image.

    The /SUBSET Imin Imax Jmin Jmax option allows to load only a  subset  of
    the  input  image or image plane. Again, a file name should be specified
    only to change the input image.

    The /WRITE option allows you to map  the  image  writeable  (instead  of
    Readonly  by  default),  a prerequisite to use some functions (e.g. KILL
    which kills pixels). The mapped image is  then  non-shareable  by  other
    users...

    You can combine /PLANE and /SUBSET options.