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ImageMagick Image Merger
#!/bin/sh
# IMAGE COMPOSITOR
# Author: Donald L. Merand
# Description: Merge images in a directory together into one composite image.
# Be careful, this program is recursive and can eat up some disk space
# creating images in subdirectories.
# default program options
RESULTSDIR="_results"
DIMENSIONS="640"
EXTENSION="png"
# conversion options
BLEND=50
COMPOSITE=$(which composite)
# help message
function usage {
#pass a message if you want
[ ! -z "$1" ] && echo "$1\n"
cat << USAGE
Usage: imagecomp <options> image_dir
Options:
-d – Results directory (default _results)
-s – Result image size (default 640x640)
-e – Result image type (default png)
USAGE
}
#get command line params
while getopts ":hd:s:e:" OPTNAME
do
case "$OPTNAME" in
"h")
usage
exit
;;
"d")
RESULTSDIR=$OPTARG
;;
"s")
DIMENSIONS=$OPTARG
;;
"e")
EXTENSION=$OPTARG
;;
"?")
echo "Unknown option $OPTARG"
;;
":")
echo "No argument value for option $OPTARG"
;;
*)
# Should not occur
echo "Unknown error while processing options"
;;
esac
done
#now get the non-options, in this case `image_dir`
shift $(($OPTIND - 1))
DIR="$1"
# check passed parameters
if [ -z "$DIR" ]; then
usage "Please choose a directory where images to composite are stored."
exit 1
fi
if [ ! -d "$DIR" ]; then
usage "Please make sure you're passing a directory with images, not just a file."
exit 1
fi
if [ ! "$COMPOSITE" ]; then
usage "Please install ImageMagick"
exit 1
fi
# define image compositing as a reusable function
function composite {
# expects only a directory of $EXENSION files as an input
DIR="$1"
#exit if no input parameter
[ -z "$DIR" ] && exit 1
#exit if current dir is empty or only has one file
dir_count=$(ls "$DIR" | wc -l)
if [ $dir_count -eq 0 -o $dir_count -eq 1 ]; then
exit 1
fi
NEWIMAGEDIR="$DIR/$RESULTSDIR"
#create the results directory if it doesn't exist already
[ ! -d "$NEWIMAGEDIR" ] && mkdir "$NEWIMAGEDIR"
#set our initial counter
x=1
#loop through the images and combine them
for image in "$DIR"/{*.png,*.jpg,*.gif,*.tiff}; do
if [ -e "$image" ]; then
echo "adding $image to $NEWIMAGEDIR..."
if [ $((x % 2)) -eq 1 ]; then
prev_image="$image"
else
#if the result is a file, composite it in
$COMPOSITE -strip -resize "$DIMENSIONS" -blend "$BLEND" "$image" "$prev_image" "$NEWIMAGEDIR/$x.$EXTENSION"
fi
x=$((x + 1))
fi
done
#now recurse...
composite "$NEWIMAGEDIR"
}
#now run the actual image compositing
composite "$DIR"
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