HDF_DFR8_GETIMAGE procedure retrieves an
image and optionally, its palette, from a Hierarchical Data Format file.
A scalar string containing the name of the file to be read.
A named variable in which the image is returned.
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.