#!/bin/bash # # Developed by Fred Weinhaus 10/3/2013 .......... revised 10/12/2014 # # ------------------------------------------------------------------------------ # # Licensing: # # Copyright © Fred Weinhaus # # My scripts are available free of charge for non-commercial use, ONLY. # # For use of my scripts in commercial (for-profit) environments or # non-free applications, please contact me (Fred Weinhaus) for # licensing arrangements. My email address is fmw at alink dot net. # # If you: 1) redistribute, 2) incorporate any of these scripts into other # free applications or 3) reprogram them in another scripting language, # then you must contact me for permission, especially if the result might # be used in a commercial or for-profit environment. # # My scripts are also subject, in a subordinate manner, to the ImageMagick # license, which can be found at: http://www.imagemagick.org/script/license.php # # ------------------------------------------------------------------------------ # #### # # USAGE: aspectcrop [-a aspect] [-g gravity] infile outfile # USAGE: aspectcrop [-help] # # OPTIONS: # # -a aspect aspect ratio value desired; width to height ratio; values # can be either a float or as two floats separated by a # colon; default is input aspect ratio (no change) # -g gravity gravity alignment for cropping; any IM -gravity value; # default=center # ### # # NAME: ASPECTCROP # # PURPOSE: To crop an image to a specified aspect ratio. # # DESCRIPTION: ASPECTPAD crops an image to a specified aspect ratio. # # OPTIONS: # # -a aspect ... ASPECT is the desired width to height aspect ratio. Values are # either floats>0, such as 2 (landscape) or 0.5 (portrait), or two floats # separate by a colon (and no spaces), such a 2:1 (landscale) or 1:2 (portrait). # The default is input aspect ratio (no change). # # -g gravity ... GRAVITY alignment for cropping; Any IM -gravity setting is # allowed. Options are: center (c), north (n), south (s), east (e), west (w), # northwest (nw), northeast (ne), southwest, (sw) or southeast (se). The # default=center. # # CAVEAT: No guarantee that this script will work on all platforms, # nor that trapping of inconsistent parameters is complete and # foolproof. Use At Your Own Risk. # ###### # # set default values aspect="" gravity="center" # set directory for temporary files dir="." # suggestions are dir="." or dir="/tmp" # set up functions to report Usage and Usage with Description PROGNAME=`type $0 | awk '{print $3}'` # search for executable on path PROGDIR=`dirname $PROGNAME` # extract directory of program PROGNAME=`basename $PROGNAME` # base name of program usage1() { echo >&2 "" echo >&2 "$PROGNAME:" "$@" sed >&2 -e '1,/^####/d; /^###/g; /^#/!q; s/^#//; s/^ //; 4,$p' "$PROGDIR/$PROGNAME" } usage2() { echo >&2 "" echo >&2 "$PROGNAME:" "$@" sed >&2 -e '1,/^####/d; /^######/g; /^#/!q; s/^#*//; s/^ //; 4,$p' "$PROGDIR/$PROGNAME" } # function to report error messages errMsg() { echo "" echo $1 echo "" usage1 exit 1 } # function to test for minus at start of value of second part of option 1 or 2 checkMinus() { test=`echo "$1" | grep -c '^-.*$'` # returns 1 if match; 0 otherwise [ $test -eq 1 ] && errMsg "$errorMsg" } # test for correct number of arguments and get values if [ $# -eq 0 ] then # help information echo "" usage2 exit 0 elif [ $# -gt 6 ] then errMsg "--- TOO MANY ARGUMENTS WERE PROVIDED ---" else while [ $# -gt 0 ] do # get parameter values case "$1" in -help) # help information echo "" usage2 exit 0 ;; -a) # get aspect shift # to get the next parameter # test if parameter starts with minus sign errorMsg="--- INVALID ASPECT SPECIFICATION ---" checkMinus "$1" aspect=`expr "$1" : '\([.0-9]*[:]*[.0-9]*\)'` [ "$aspect" = "" ] && errMsg "--- ASPECT=$aspect MUST BE ONE OR TWO FLOATS GREATER THAN OR EQUAL TO 0 SEPARATED BY A COLON ---" ;; -g) # get gravity shift # to get the next parameter # test if parameter starts with minus sign errorMsg="--- INVALID GRAVITY SPECIFICATION ---" checkMinus "$1" gravity="$1" gravity=`echo "$gravity" | tr "[:upper:]" "[:lower:]"` case "$gravity" in center|c) gravity="center" ;; north|n) gravity="north" ;; south|s) gravity="south" ;; east|e) gravity="east" ;; west|w) gravity="west" ;; northwest|nw) gravity="northwest" ;; northeast|nw) gravity="northeast" ;; southwest|sw) gravity="southwest" ;; southeast|se) gravity="southeast" ;; *) errMsg "--- GRAVITY=$gravity IS AN INVALID VALUE ---" esac ;; -) # STDIN and end of arguments break ;; -*) # any other - argument errMsg "--- UNKNOWN OPTION ---" ;; *) # end of arguments break ;; esac shift # next option done # # get infile and outfile infile="$1" outfile="$2" fi # test that infile provided [ "$infile" = "" ] && errMsg "NO INPUT FILE SPECIFIED" # test that outfile provided [ "$outfile" = "" ] && errMsg "NO OUTPUT FILE SPECIFIED" # setup temporary images tmpA1="$dir/aspectcrop_1_$$.mpc" tmpA2="$dir/aspectcrop_1_$$.cache" trap "rm -f $tmpA1 $tmpA2;" 0 trap "rm -f $tmpA1 $tmpA2; exit 1" 1 2 3 15 trap "rm -f $tmpA1 $tmpA2; exit 1" ERR # read the input image and test validity. convert -quiet "$infile" +repage "$tmpA1" || errMsg "--- FILE $infile DOES NOT EXIST OR IS NOT AN ORDINARY FILE, NOT READABLE OR HAS ZERO SIZE ---" # get size and aspect ratio of input ww=`convert $tmpA1 -ping -format "%w" info:` hh=`convert $tmpA1 -ping -format "%h" info:` ratio=`convert xc: -format "%[fx:$ww/$hh]" info:` #echo "ww=$ww; hh=$hh ratio=$ratio;" # copy input to output if aspect is not specified if [ "$aspect" = "" ]; then convert $tmpA1 $outfile exit fi # get aspect aspect1=`echo $aspect | cut -d\: -f1` aspect2=`echo $aspect | cut -d\: -f2` test=`convert xc: -format "%[fx:($aspect2 == $aspect1)?1:0]" info:` #echo "aspect1=$aspect1; aspect2=$aspect2;" if [ $aspect1 -eq 0 -o $aspect2 -eq 0 ]; then errMsg "--- DESIRED WIDTH OR HEIGHT MUST NOT BE ZERO ---" elif [ "$aspect2" = "" ]; then aspect=$aspect1 elif [ $test -eq 1 ]; then aspect=$aspect1 else aspect=`convert xc: -format "%[fx:$aspect1/$aspect2]" info:` fi #echo "aspect=$aspect;" # test if aspect >= ratio test=`convert xc: -format "%[fx:$aspect>=$ratio?1:0]" info:` [ $test -eq 1 ] && format="larger" || format="smaller" #echo "format=$format;" # compute width and height of output if [ "$format" = "larger" ]; then width=$ww height=`convert xc: -format "%[fx:$hh*$ratio/$aspect]" info:` elif [ "$format" = "smaller" ]; then width=`convert xc: -format "%[fx:$ww*$aspect/$ratio]" info:` height=$hh fi # process image convert $tmpA1 -gravity $gravity -crop ${width}x${height}+0+0 +repage "$outfile" exit 0