Identifies the ImageGear data types.
| AM_TID_META_INT8 | Data type is 8 bit signed integer. |
| AM_TID_META_UINT8 | Data type is 8 bit unsigned integer. |
| AM_TID_META_INT16 | Data type is 16 bit signed integer. |
| AM_TID_META_UINT16 | Data type is 16 bit unsigned integer. |
| AM_TID_META_INT32 | Data type is 32 bit signed integer. |
| AM_TID_META_UINT32 | Data type is 32 bit unsigned integer. |
| AM_TID_META_BOOL | Data type is Boolean. |
| AM_TID_META_STRING | Data type is String. |
| AM_TID_META_RATIONAL_UINT32 | Data type is Rational 32 bit unsigned integer. |
| AM_TID_META_RATIONAL_INT32 | Data type is Rational 32 bit bit signed integer. |
| AM_TID_META_FLOAT | Data type is Float. |
| AM_TID_META_DOUBLE | Data type is Double. |
| AM_TID_RAW_DATA | Data type is Raw Data. |
| AM_TID_META_INT64 | Data type is 64 bit signed integer. |
| AM_TID_META_UINT64 | Data type is 64 bit unsigned integer. |
| AM_TID_META_STRING32 | Data type is a String holding up to 32 characters. Corresponds to TW_STR32 data type of TWAIN API specification. |
| AM_TID_META_STRING64 | Data type is a String holding up to 64 characters. Corresponds to TW_STR64 data type of TWAIN API specification. |
| AM_TID_META_STRING128 | Data type is a String holding up to 128 characters. Corresponds to TW_STR128 data type of TWAIN API specification. |
| AM_TID_META_STRING255 | Data type is a String holding up to 254 characters. Corresponds to TW_STR255 data type of TWAIN API specification. |
| AM_TID_META_STRING1024 | Data type is a String holding up to 1024 characters. Corresponds to TW_STR1024 data type of TWAIN API specification. |
| AM_TID_META_STRING_UNICODE512 | Data type is a String holding up to 512 unicode (wchar_t) characters. Corresponds to TW_UNI512 data type of TWAIN API specification. |
| AM_TID_META_DRECT | Data type is a AT_DRECT. |