It is a tutorial created so you may paint grass or bushes or flowers in-game with panorama software.
There’s a phrase file contained in the zip with the directions.
IT IS RECOMMENDED that the GE “Big Editor” program be used. I go away the hyperlink in case somebody wants it:
GIANTS Editor 8.1.Zero win64
Do not forget that lots of the mod maps could not work these steps so you must do them manually as indicated within the phrase file.