EXTRACT
Keywords: greg

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EXTRACT

            EXTRACT

        Extracts a subset of an input image. The output image can be larger than
        the subset; in this case the additional pixels are blanked if the output
        image  is  being  created, unmodified if it already exists.  It works on
        images of any dimensions, and any subset  of  the  input  image  can  be
        placed anywhere in the output image.

        This  task  can also be used to build a N+P dimensional image from a set
        of N dimensional ones, by initializing the output image  once  with  its
        full dimensions and then placing the (subset of the) input images at the
        appropriate place in the output image.