Convert an image table to an Animated GIF

to-anim.sh

#!/usr/bin/env bash

display_usage() {
	echo "This script must be passed an image table PNG."
	echo
	echo "Usage: $0 image-table-32-32.png"
}
# if less than two arguments supplied, display usage
if [  $# -lt 1 ]
then
	display_usage
	exit 1
fi
# check whether user has supplied -h or --help, display usage
if [[ ( $# == "--help") ||  $# == "-h" ]]
then
	display_usage
	exit 0
fi

# -----

# input file details
fullname=$(basename -- "$1")
filename="${fullname%.*}"

# extract cell size from filename
regex_table=".*\-table\-([0-9]+)\-([0-9]+)\.png"
if [[ ${fullname} =~ ${regex_table} ]]
then
	W="${BASH_REMATCH[1]}"
	H="${BASH_REMATCH[2]}"
else
	display_usage
	exit 1
fi

# convert to Animated GIF
magick -dispose background -delay 1 -loop 0 "$1" +repage -crop "${W}x${H}" +repage "${filename}.gif"

# output specifications
magick identify -format "${filename}.gif: %n frames\n" "${filename}.gif" | head -1