HISTO_CLOUD

        HISTO_CLOUD

    Makes  the cross histogram of two input images.   The  result  is  a ta-
    ble of two columns:
      - First column :  value of pixel (I,J) of first image
      - Second column :  value of pixel (I,J) of second image

    Using the GreG command POINT on this  output  table   will   produce   a
    cloud  plot  of the correlation between the two images.  This program is
    reasonably well adapted for small images, but you should use HISTO_CROSS
    for large images.