Lists all PCX tag identifiers.
Values:
| IGMDTAG_ID_PCX_FORMAT | PCX metadata format identifier. |
| IGMDTAG_ID_PCX_MANUFACTURER | Manufacturer magic value. |
| IGMDTAG_ID_PCX_VERSION_INFO | Version info. |
| IGMDTAG_ID_PCX_ENCODE | Encoding type. |
| IGMDTAG_ID_PCX_BIT_PER_PLANE | Bit per plane. |
| IGMDTAG_ID_PCX_X1 | Left image coordinate to display. |
| IGMDTAG_ID_PCX_Y1 | Top image coordinate to display. |
| IGMDTAG_ID_PCX_X2 | RIght image coordinate to display. |
| IGMDTAG_ID_PCX_Y2 | Bottom image coordinate to display. |
| IGMDTAG_ID_PCX_H_RES | Horizontal Resolution of creating device. |
| IGMDTAG_ID_PCX_V_RES | Vertical Resolution of creating device. |
| IGMDTAG_ID_PCX_PALETTE_TABLE | Palette table. |
| IGMDTAG_ID_PCX_VIDEO_MODE | Video mode. |
| IGMDTAG_ID_PCX_NUM_OF_PLANES | Number of planes. |
| IGMDTAG_ID_PCX_BYTES_PER_LINE | Bytes per line. |
| IGMDTAG_ID_PCX_PALETTE_INFO | Palette info. |
| IGMDTAG_ID_PCX_SCANNER_H_RES | Scanner H_Res. |
| IGMDTAG_ID_PCX_SCANNER_V_RES | Scanner V_Res. |
| IGMDTAG_ID_PCX_EXTRA | Extra data length. |