Version of Gif file.
The only 2 official versions is GIF87a and GIF89a.
Values
GIF87a
First version of Gif file format from May 1987.
Note: The checking of unsupported blocks disabled by default to save some time. To enable supported blocks check set yagp_strict_version_check debug variable.
GIF89a
Second and actual version of Gif file format from July 1989.
Unknown(version:String)
Unknown version of Gif file.