#!/bin/bash # # Developed by Fred Weinhaus 2/23/2018 .......... revised 2/23/2018 # # ------------------------------------------------------------------------------ # # 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: shadows [-t type] [-c color] [-r radius] [-s sigma] [-d direction] # [-b bgcolor] [-a alpha] infile outfile # USAGE: shadows [-h or -help] # # OPTIONS: # # -t type type of shadow; inner (i) or outer (o); default=inner # -c color shadow color; any valid Imagemagick opaque color may be used; # default=black. # -r radius radius of shadow; integer>=0; default=0 (determined from # sigma) # -s sigma sigma (blur) of shadow; float>=0; default=5 # -d direction direction of shadow; -360<=integer<=360; default=135 # -b bcolor color to put under the alpha channel; any valid Imagemagick # opaque color may be used; default is not to replace the image # texture with color. # -a alpha flag to specify to leave alpha channel enabled; yes (y) or # no (n); default=no; only allowed for type=inner # # infile must have an alpha channel # ### # # NAME: SHADOWS # # PURPOSE: To apply drop shadows to an image. # # DESCRIPTION: SHADOWS applies drop shadows to an image that has an alpha channel. # The alpha channel should be binary or at worst binary but anti-aliased. If there # is no alpha channel or the alpha channel is full opaque, then the no shadow will # be created. The inner shadow will appear at the inside edges of the white part of # the alpha channel. The outer shadow will appear at the outside edges of the white # part of the alpha channel. In either case, the result will have the alpha channel # removed to show the colors under the alpha channel. There is an option for the # inner shadow to keep the alpha channel enabled. Note that the inner shadow may # look like an outer bevel. This is an optical illusion. # # OPTIONS: # # -t type ... TYPE of shadow. The choices are: inner (i) or outer (o). The default=inner. # # -c color ... COLOR of shadow; any valid Imagemagick opaque color may be used. # The default=black. # # -r radius ... RADIUS of the shadow. Values are integer>=0. The default=0. The actual # value will be deterined from the sigma value. # # -s sigma ... SIGMA (blur) of the shadow. Values are float>=0. The default=5. # # -d direction ... DIRECTION of the shadow. Values are -360<=integer<=360 measure # clockwise from the positive x axis. The default=135. # # -b bcolor ... (background) BCOLOR to put under the alpha channel. Any valid # Imagemagick opaque color may be used. The default is not to replace the image # texture with color. # # -a alpha ... ALPHA flag to specify whether to leave the alpha channel enabled or not. # Values are on or off. The default=off. This option is only allowed for # type=inner. # # 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 type="inner" # type of shadow color="black" # color of shadow radius=0 # radius of shadow sigma=5 # sigma of shadow direction=135 # direction of shadow bcolor="" # background color to put under the alpha channel alpha="off" # enable alpha channel for inner shadow # 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 16 ] then errMsg "--- TOO MANY ARGUMENTS WERE PROVIDED ---" else while [ $# -gt 0 ] do # get parameter values case "$1" in -h|-help) # help information echo "" usage2 exit 0 ;; -t) # get type shift # to get the next parameter # test if parameter starts with minus sign errorMsg="--- INVALID TYPE SPECIFICATION ---" checkMinus "$1" type=`echo "$1" | tr '[A-Z]' '[a-z]'` case "$type" in inner|i) type="inner" ;; outer|o) type="outer" ;; *) errMsg "--- TYPE=$type IS AN INVALID VALUE ---" esac ;; -c) # get color shift # to get the next parameter # test if parameter starts with minus sign errorMsg="--- INVALID COLOR SPECIFICATION ---" checkMinus "$1" color="$1" ;; -r) # get radius shift # to get the next parameter - spread # test if parameter starts with minus sign errorMsg="--- INVALID RADIUS SPECIFICATION ---" checkMinus "$1" radius=`expr "$1" : '\([0-9]*\)'` [ "$radius" = "" ] && errMsg "RADIUS=$radius MUST BE A NON-NEGATIVE INTEGER" ;; -s) # get sigma shift # to get the next parameter - spread # test if parameter starts with minus sign errorMsg="--- INVALID SIGMA SPECIFICATION ---" checkMinus "$1" sigma=`expr "$1" : '\([.0-9]*\)'` [ "$sigma" = "" ] && errMsg "SIGMA=$sigma MUST BE A NON-NEGATIVE FLOAT" ;; -d) # get direction shift # to get the next parameter - spread # test if parameter starts with minus sign errorMsg="--- INVALID DIRECTION SPECIFICATION ---" #checkMinus "$1" direction=`expr "$1" : '\([0-9]*\)'` [ "$direction" = "" ] && errMsg "DIRECTION=$direction MUST BE A NON-NEGATIVE INTEGER" test1=`echo "$direction > 360" | bc` test2=`echo "$direction < -360" | bc` [ $test1 -eq 1 -o $test2 -eq 1 ] && errMsg "--- DIRECTION=$direction MUST BE A INTEGER BETWEEN -360 AND 360 ---" ;; -b) # get bcolor shift # to get the next parameter # test if parameter starts with minus sign errorMsg="--- INVALID BCOLOR SPECIFICATION ---" checkMinus "$1" bcolor="$1" ;; -a) # get alpha shift # to get the next parameter # test if parameter starts with minus sign errorMsg="--- INVALID ALPHA SPECIFICATION ---" checkMinus "$1" alpha=`echo "$1" | tr '[A-Z]' '[a-z]'` case "$alpha" in on) ;; off) ;; *) errMsg "--- ALPHA=$alpha 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" inname=`convert $infile -format "%t" info:` # set up temporary images tmpA1="$dir/shadows_$$.mpc" tmpB1="$dir/shadows_$$.cache" trap "rm -f $tmpA1 $tmpB1;" 0 trap "rm -f $tmpA1 $tmpB1; exit 1" 1 2 3 15 #trap "rm -f $tmpA1 $tmpB1; exit 1" ERR # set up for adding color under alpha channel if [ "$bcolor" != "" ]; then coloring="-background $bcolor -alpha background" else coloring="" fi # read the input image into the temp files and test validity. convert -quiet "$infile" $coloring +repage $tmpA1 || errMsg "--- FILE $infile DOES NOT EXIST OR IS NOT AN ORDINARY FILE, NOT READABLE OR HAS ZERO SIZE ---" # set up for negate for outer shadow if [ "$type" = "outer" ]; then negating="-negate" else negating="" fi # subtract 180 from direction angle=$((direction-180)) if [ "$type" = "inner" -a "$alpha" = "on" ]; then # read image # clone and turn off alpha # clone and extract alpha # delete original # clone alpha, colorize, a apply motion blur # composite multiply: image (without alpha), shadow, mask # delete image with no alpha, motion blur image # put original alpha back onto image # write output convert $tmpA1 \ \( -clone 0 -alpha off \) \ \( -clone 0 -alpha extract \) \ -delete 0 \ \( -clone 1 \( +clone -fill "$color" -colorize 100 \) \ +swap +duplicate -compose over -composite \ -motion-blur ${radius}x${sigma}+${angle} \) \ \( -clone 0,2,1 -compose multiply -composite \) \ -delete 0,2 \ +swap -alpha off -compose copy_opacity -composite \ "$outfile" else # read image # clone and turn off alpha # clone and extract alpha # delete original # clone alpha, colorize, a apply motion blur # composite multiply: image (without alpha), shadow, mask # write output convert $tmpA1 \ \( -clone 0 -alpha off \) \ \( -clone 0 -alpha extract $negating \) \ -delete 0 \ \( -clone 1 \( +clone -fill "$color" -colorize 100 \) \ +swap +duplicate -compose over -composite \ -motion-blur ${radius}x${sigma}+${angle} \) \ -swap 1,2 \ -compose multiply -composite \ "$outfile" fi exit 0