-i, --identify
Display details about the image file.

-d, --decode
Convert frames to another image format.

-v, --verbose
Display additional information on standard output.

-f, --file=FILE
Read image data from FILE instead of standard input.

-F, --format=FMT
When decoding, set the output format to FMT.  One of png,
pam, ppm or pbm.

--output-prefix=NAME
When decoding, output filenames will begin with NAME
instead of "out".

-n, --no-palette
Instead of performing palette lookups, the palette index
values for each pixel are used directly as grayscale level.

-p, --palette=FILE
Load FILE as the base image palette.

-O, --override=FILE
Load FILE as the override palette.

-V, --version
Print a version message and then exit.

-H, --help
Print a help message and then exit.