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.