Documentation on views

Task: views
Purpose: Generate a projection of the datacube
Categories: visual display

        VIEWS is a MIRIAD task which generates projections of a cube, viewed
        as if the cube was rotating around its y axis. The view is also
        from an angle "phi" to the x-z plane. The output is intended to be
        fed into a tvmovie program, to view a rotating cube. The projection is
        a thresholding operation -- pixels values less than the threshold are
        transparent, a pixel greater than the threshold is opaque, with a
        brightness given by the pixel value.

Key: in
	Standard in keyword. Use `help in' for more information.

Key: region
	Standard region keyword. Use `help region' for more information.

Key: out
	Standard out keyword. Use `help out' for more information.

Key: phi
        The elevation angle, with respect to the x-z plane, of the observer
        (degrees). This must be in the range [0,90]. Default is 30.

Key: aspect
        Aspect ratio of the different axes. Two values can be given, giving
        the y/x aspect ratio, and the z/x aspect ratio. Default should be
        fine.

Key: thresh
        Threshold used in determining which details appear in the output.
        Default is the average of the image minima and maxima.

Key: imsize
        Size of the output cube. Default is 128x128x64 (should be adequate).