imageresize

#!/bin/bash
#
# imagecrop : Resize and crop image to specified size
#
# Version 0.2 (2010/07/21)
# (c) 2010 Mathieu Comandon
# Licensed under the terms of the GPL Version 3
#
set -e

CONVERT=convert

if [ -z $(which $CONVERT) ] ; then
	echo "imagemagick is not installed"
	exit 2
fi

usage()
{
cat << EOF
Usage: $0
Resize an image to a given maximum size

OPTIONS:
  -d, --dir=PATH	Input directory containing the images to convert
  -s, --size=SIZE	Maximum size of the output image
  -r, --keep-ratio	Keep ratio, do not make a square image
  -v, --verbose		Verbose mode
  -h, --help		Prints this message
EOF
}

#Parse arguments
if [ "$#" -eq 0 ] ; then
    usage
    exit 2
fi

PARAMS=`getopt -n $0 -o d:s:rvh --long dir:,size:,keep-ratio,verbose,help -- "$@"`
eval set -- "$PARAMS"
while true ; do
    case "$1" in
        -d|--dir) basedir=$2; shift 2 ;;
        -s|--size) size=$2; shift 2 ;;
        -h|--help) usage ; exit 1 ;;
        -v|--verbose) verbose=1 ; shift ;;
        -r|--keep-ratio) keep_ratio=1; shift ;;
        --) shift ; break ;;
        *) usage ; exit 2 ;;
    esac
done

#Error checking
error_state=0;

if [ -z "$basedir" ] ; then
    echo "No input dir specified !"
    error_state=1
fi

if [ -z "$size" ] ; then
    echo "No size specified !"
    error_state=1
fi

if [ "$error_state" = 1 ] ; then
    echo "There are errors in your arguments, exiting."
    exit 2
fi

ext='.jpg'

for sourcefile in $(ls $basedir) ; do
	filename=${sourcefile%\.*}
	destfile=${filename}_${size}${ext}
	if [ "$verbose" = 1 ] ; then
		echo "Converting "$basedir$sourcefile
	fi
	if [ -z $keep_ratio ] ; then
		square_image_params="-gravity center -crop ${size}x${size}+0+0 +repage"
		geometry_modifier="^"
	fi
	$CONVERT  -thumbnail "${size}x${size}${geometry_modifier}" $square_image_params -sharpen 0.25x0.25  -quality 95 -format jpg $basedir$sourcefile $basedir$destfile
done

# TODO
# Adding Annotation To Cropped Thumbnails Using ImageMagick
# http://return-true.com/2009/03/adding-annotation-to-cropped-thumbnails-using-imagemagick/

# Cropping The Thumbnails
# $CONVERT -size 120x108 'path/to/file.jpg'  -thumbnail 120x108^ -gravity center -extent 120x108 'path/to/output.jpg'

# Adding The Annotation
# $CONVERT -size 120x108 'path/to/file.jpg'  -thumbnail 120x108^ -gravity center -extent 120x108 -gravity south -background black -fill '#cccccc' -font '/path/to/font.ttf' -pointsize 8 -splice 0x12 -annotate +0+1 '%[width]x%[height] %[size]' 'path/to/output.jpg'