ri_id	IN:	Raster image identifier returned by GRcreate or GRselect
	gr_name	OUT:	Buffer for the name of the raster image
	ncomp	OUT:	Number of components in the raster image
	data_type	OUT:	Data type of the raster image data
	interlace_mode	OUT:	Interlace mode of the stored raster image data
	dim_sizes	OUT:	Sizes of raster image dimension
	num_attrs	OUT:	Number of attributes attached to the raster image

	Purpose	Retrieves general information about a raster image.
	Return value	Returns SUCCEED (or 0) if successful and FAIL (or -1) otherwise.
	Description	GRgetiminfo retrieves the name, number of components, data type, interlace mode, dimension sizes, and number of attributes of the raster image identified by the parameter ri_id.
		GRgetiminfo stores the name, number of components, data type, interlace mode and dimension sizes of the image in the parameters gr_name, ncomp, data_type, interlace_mode, and dim_sizes, respectively. It also retrieves the number of attributes attached to the image into the parameter num_attrs. If the value of any of the output parameters are set to NULL in C, the corresponding information will not be retrieved.
		The buffer gr_name is assumed to have sufficient space allocated to store the entire name of the raster image.
		The valid values of the parameter data_type are listed in Table 1A in Section I of this manual.

	FORTRAN	integer function mggiinf(ri_id, gr_name, ncomp, data_type, interlace_mode, dim_sizes, num_attrs)
		integer ri_id, ncomp, data_type, interlace_mode, num_attrs
		integer dim_sizes[2]
		character*(*) gr_name