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. |