/usr/bin/gifsicle

Gifsicle manipulates GIF images. Its most common uses include combining
single images into animations, adding transparency, optimizing animations for
space, and printing information about GIFs.

Usage: gifsicle [OPTION | FILE | FRAME]...

Mode options (at most one, before any filenames):
  -m, --merge                   Merge mode: combine inputs, write stdout
  -b, --batch                   Batch mode: modify inputs, write back to
                                same filenames
  -e, --explode                 Explode mode: write N files for each input,
                                one per frame, to 'input.frame-number'
  -E, --explode-by-name         Explode mode, but write 'input.name'

General options (also --no-OPTION for info and verbose):
  -I, --info                    Print info about input GIFs
  -I -I                         Print info to standard error; do not suppress
                                normal output
  --color-info, --cinfo         --info plus colormap details
  --extension-info, --xinfo     --info plus extension details
  --size-info, --sinfo          --info plus compression information
  -V, --verbose                 Print progress (files read and written)
  -h, --help                    Print this message and exit
  --version                     Print version number and exit
  -o, --output FILE             Write output to FILE
  -w, --no-warnings             Don't report warnings
  --no-ignore-errors            Quit on very erroneous input GIFs
  --max-screen WxH              Reject logical screens bigger than WxH
                                [16384x16384]
  --conserve-memory             Conserve memory at the expense of speed
  --nextfile, --multifile       Support concatenated GIF files

Frame selections:               #num, #num1-num2, #num1-, #name

Frame change options:
  --delete FRAMES               Delete FRAMES from input
  --insert-before FRAME GIFS    Insert GIFS before FRAMES in input
  --append GIFS                 Append GIFS to input
  --replace FRAMES GIFS         Replace FRAMES with GIFS in input
  --done                        Done with frame changes

Image options (also --no-OPTION and --same-OPTION):
  -B, --background COL          Make COL the background color
  --crop X,Y+WxH, --crop X,Y-X2,Y2
                                Crop the image
  --crop-transparency           Crop transparent borders off the image
  --flip-horizontal, --flip-vertical
                                Flip the image
  -i, --interlace               Turn on interlacing
  -S, --logical-screen WxH      Set logical screen to WxH
  -p, --position X,Y            Set frame position to (X,Y)
  --rotate-90, --rotate-180, --rotate-270, --no-rotate
                                Rotate the image
  -t, --transparent COL         Make COL transparent

Extension options:
  --app-extension N D           Add an app extension named N with data D
  -c, --comment TEXT            Add a comment before the next frame
  --extension N D           Add an extension number N with data D
  -n, --name TEXT               Set next frame's name
  --no-comments, --no-names, --no-extensions
                                Remove comments (names, extensions) from input
Animation options (also --no-OPTION and --same-OPTION):
  -d, --delay TIME              Set frame delay to TIME (in 1/100sec)
  -D, --disposal METHOD         Set frame disposal to METHOD
  -l, --loopcount[=N]           Set loop extension to N (default forever)
  -O, --optimize[=LEVEL]        Optimize output GIFs
  -U, --unoptimize              Unoptimize input GIFs
  -j, --threads[=THREADS]       Use multiple threads to improve speed

Whole-GIF options (also --no-OPTION):
  --careful                     Write larger GIFs that avoid bugs in other
                                programs
  --change-color COL1 COL2      Change COL1 to COL2 throughout
  -k, --colors N                Reduce the number of colors to N
  --color-method METHOD         Set method for choosing reduced colors
  -f, --dither                  Dither image after changing colormap
  --gamma G                     Set gamma for color reduction [2.2]
  --lossy[=LOSSINESS]           Alter image colors to shrink output file size
                                at the cost of artifacts and noise
  --resize WxH                  Resize the output GIF to WxH
  --scale XFACTOR[xYFACTOR]     Scale the output GIF by XFACTORxYFACTOR
  --resize-width W              Resize to width W and proportional height
  --resize-height H             Resize to height H and proportional width
  --resize-fit WxH              Shrink to fit WxH, preserving aspect ratio
  --resize-touch WxH            Resize to touch WxH, preserving aspect ratio
  --resize-geometry GEOM        Resize to a geometry specification
  --resize-method METHOD        Set resizing method
  --resize-colors N             Resize can add new colors up to N
  --transform-colormap CMD      Transform each output colormap by shell CMD
  --use-colormap CMAP           Output GIF uses colors from CMAP, which can
                                be 'web', 'gray', 'bw', or a GIF file
  --use-exact-colormap CMAP     Same, but use CMAP as is (not a subset)
  --gray                        Same as --use-colormap gray

Report bugs to <ekohler@gmail.com>.
Too much information? Try 'gifsicle --help | less'.