Lists all TGA tag identifiers.
Values:
| IGMDTAG_ID_TGA_FORMAT | TGA metadata format identifier. |
| IGMDTAG_ID_TGA_HEAD | Header data section. |
| IGMDTAG_ID_TGA_HEAD_IDLENGTH | ID length. |
| IGMDTAG_ID_TGA_HEAD_COLORMAPTYPE | Color map type. |
| IGMDTAG_ID_TGA_HEAD_IMAGETYPE | Image type. |
| IGMDTAG_ID_TGA_HEAD_CMAPSTART | CMap start. |
| IGMDTAG_ID_TGA_HEAD_CMAPLENGTH | CMap length. |
| IGMDTAG_ID_TGA_HEAD_CMAPDEPTH | CMap depth. |
| IGMDTAG_ID_TGA_HEAD_XOFFSET | Absolute horizontal coordinate for the lower left corner of the image as it is positioned on a display device having an origin at the lower left of the screen. |
| IGMDTAG_ID_TGA_HEAD_YOFFSET | Absolute vertical coordinate for the lower left corner of the image as it is positioned on a display device having an origin at the lower left of the screen. |
| IGMDTAG_ID_TGA_HEAD_WIDTH | Image width. |
| IGMDTAG_ID_TGA_HEAD_HEIGHT | Image height. |
| IGMDTAG_ID_TGA_HEAD_PIXELDEPTH | Pixel depth. |
| IGMDTAG_ID_TGA_HEAD_IMAGEDESCRIPTOR | Image descriptor. |
| IGMDTAG_ID_TGA_FOOT | Footer data section. |
| IGMDTAG_ID_TGA_FOOT_EXTENSION_OFFSET | Extension offset. |
| IGMDTAG_ID_TGA_FOOT_DEVELOPER_OFFSET | Developer offset. |
| IGMDTAG_ID_TGA_FOOT_SIGNATURE | Signature string. |
| IGMDTAG_ID_TGA_EXT | Extension data section. |
| IGMDTAG_ID_TGA_EXT_SIZE | Extension size. |
| IGMDTAG_ID_TGA_EXT_AUTHORNAME | Author name. |
| IGMDTAG_ID_TGA_EXT_AUTHORCOMMENT | Author comment. |
| IGMDTAG_ID_TGA_EXT_STAMPMONTH | Stamp month. |
| IGMDTAG_ID_TGA_EXT_STAMPDAY | Stamp day. |
| IGMDTAG_ID_TGA_EXT_STAMPYEAR | Stamp year. |
| IGMDTAG_ID_TGA_EXT_STAMPHOUR | Stamp hour. |
| IGMDTAG_ID_TGA_EXT_STAMPMINUTE | Stamp minute. |
| IGMDTAG_ID_TGA_EXT_STAMPSECOND | Stamp second. |
| IGMDTAG_ID_TGA_EXT_JOBNAME | Job name . |
| IGMDTAG_ID_TGA_EXT_JOBHOUR | Job hour value. |
| IGMDTAG_ID_TGA_EXT_JOBMINUTE | Job minute value. |
| IGMDTAG_ID_TGA_EXT_JOBSECOND | Job second value. |
| IGMDTAG_ID_TGA_EXT_SOFTWAREID | Software ID. |
| IGMDTAG_ID_TGA_EXT_VERSIONNUMBER | Version number. |
| IGMDTAG_ID_TGA_EXT_VERSIONLETTER | Version letter. |
| IGMDTAG_ID_TGA_EXT_KEYCOLOR | Key color. |
| IGMDTAG_ID_TGA_EXT_PIXELNUMERATOR | Pixel numerator. |
| IGMDTAG_ID_TGA_EXT_PIXELDENOMINATOR | Pixel denominator. |
| IGMDTAG_ID_TGA_EXT_GAMMANUMERATOR | Gamma numerator. |
| IGMDTAG_ID_TGA_EXT_GAMMADENOMINATOR | Gamma denominator. |
| IGMDTAG_ID_TGA_EXT_COLOROFFSET | Color offset. |
| IGMDTAG_ID_TGA_EXT_STAMPOFFSET | Stamp offset. |
| IGMDTAG_ID_TGA_EXT_SCANOFFSET | Scan offset. |
| IGMDTAG_ID_TGA_EXT_ATTRIBUTESTYPE | Attributes type. |
| IGMDTAG_ID_TGA_IMAGE_ID | Image ID tag. |