Lists all SGI tag identifiers.
Values:
| IGMDTAG_ID_SGI_FORMAT | SGI metadata format identifier. |
| IGMDTAG_ID_SGI_MAGIC | IRIS image file magic number. R/O. |
| IGMDTAG_ID_SGI_STORAGE | Storage format. R/O. |
| IGMDTAG_ID_SGI_BPC | Number of bytes per pixel channel. R/O. |
| IGMDTAG_ID_SGI_DIMENSION | Number of dimensions. R/O. |
| IGMDTAG_ID_SGI_X_SIZE | X size in pixels. R/O. |
| IGMDTAG_ID_SGI_Y_SIZE | Y size in pixels. R/O. |
| IGMDTAG_ID_SGI_Z_SIZE | Number of channels. R/O. |
| IGMDTAG_ID_SGI_PIX_MIN | Minimum pixel value. R/W. |
| IGMDTAG_ID_SGI_PIX_MAX | Maximum pixel value. R/W. |
| IGMDTAG_ID_SGI_DUMMY1 | Dummy 1 value. R/W. |
| IGMDTAG_ID_SGI_IMAGE_NAME | Image name. R/W. |
| IGMDTAG_ID_SGI_COLOR_MAP | Color map. R/O. |
| IGMDTAG_ID_SGI_DUMMY2 | Dummy 2 value. R/W. |