Lists all IFF tag identifiers.

Values:

IGMDTAG_ID_IFF_FORMAT	IFF metadata format identifier.
IGMDTAG_ID_IFF_WIDE	Image width.
IGMDTAG_ID_IFF_HIGH	Image height.
IGMDTAG_ID_IFF_XORG	Image X origin.
IGMDTAG_ID_IFF_YORG	Image Y origin.
IGMDTAG_ID_IFF_PLANES	Color map planes.
IGMDTAG_ID_IFF_MASK	Mask info.
IGMDTAG_ID_IFF_COMPRESSION	Image compression.
IGMDTAG_ID_IFF_TRAN_ASPT	Tran aspt.
IGMDTAG_ID_IFF_PAGE_W	Page width.
IGMDTAG_ID_IFF_PAGE_H	Page height.
IGMDTAG_ID_IFF_VIEW_MODE	View mode.
IGMDTAG_ID_IFF_TRANSP_COLOR	Transp color.
IGMDTAG_ID_IFF_X_ASPECT	X aspect resolution.
IGMDTAG_ID_IFF_Y_ASPECT	Y aspect resolution.