The HDF_DFR8_GETIMAGE procedure retrieves an image and optionally, its palette, from an HDF file. 
            Syntax
            HDF_DFR8_GETIMAGE, Filename, Image [, Palette]
            Arguments
            Filename
            A scalar string containing the name of the file to be read.
            Image
            A named variable in which the image is returned.
            Palette
            A named variable in which the palette is returned as a 3-element by 256-element byte array. If the image does not have an associated palette, this variable is returned as 0.
            Keywords
            None 
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