garbify.sh

#!/bin/bash
#
#                  _     _  __
#  __ _  __ _ _ __| |__ (_)/ _|_   _
# / _` |/ _` | '__| '_ \| | |_| | | |
#| (_| | (_| | |  | |_) | |  _| |_| |
# \__, |\__,_|_|  |_.__/|_|_|  \__, |
# |___/                        |___/
#
#
# Give it a filename to an image and it will turn it into zooming
# garb and save it as sample.gif.
#
# By Paul Ford in a moment of weakness

COLORS=32
FILE=$1
DELAY=30
FAST=20
PAUSE=100
LONG_PAUSE=400

convert -scale 600 $FILE f_000.png ;
convert -gravity Center -scale 400 -extent 150% -modulate 100,0,100  f_000.png f_001.png;
convert -gravity Center -rotate -1% -scale 450 -extent 133% -modulate 100,30,100 f_000.png f_002.png; 
convert -gravity Center -rotate .5% -scale 500 -extent 120% -modulate 100,50,100 f_000.png f_003.png;
convert -modulate 100,200,100 f_000.png f_004.png;
convert -rotate .01% -modulate 100,50,105 f_000.png f_005.png; 

convert -colors $COLORS -loop 0 \
	-delay $DELAY f_001.png f_002.png f_003.png \
	-colors $COLORS -delay $PAUSE f_005.png \
	-colors $COLORS -delay $FAST f_004.png f_005.png f_004.png f_005.png \
	-colors $COLORS -delay $DELAY f_004.png f_005.png \
	-colors $COLORS -delay $LONG_PAUSE f_004.png \
	-colors $COLORS -delay $DELAY f_003.png f_002.png \
	sample.gif;

rm f_00*.png;

Added "s on line 24 to support filenames with spaces in them.

Keep the original filename.gif