Specifies the angle to rotate in degrees with respect to the X (horizontal) axis.
Verbose mode (show progress). Enables printout of running scan lines.
Since the rotated image will have the same image size as the original, some parts of the image will by clipped out and lost. By specifing a (bigger) size explicitly using the `-s' option, these parts may be saved.
Print one line of command line help, similar to Usage above.
If no GIF file is given, gifrotat will try to read a GIF file from stdin.