#!/bin/bash # # Developed by Fred Weinhaus 12/12/2012 .......... revised 5/29/2015 # # ------------------------------------------------------------------------------ # # 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: posteredges [-w width ] [-a amount] [-m method] [-n number] [-b blur] # [-s sat] infile outfile # # USAGE: posteredges [-help] # # OPTIONS: # # -w width width of edges; float>0; default=3 # -a amount amount (strenght) of edges; float>0; default=5 # -m method method of reducing colors; choices are: posterize (p) or # colors (c); default=posterize # -n number number of colors; integer>=2; default is no color reduction # -b blur blurring (smoothing) of result; float>=0; default=0.5 # -s sat saturation amount; integer>0; default=100 (no change) # ### # # NAME: POSTEREDGES # # PURPOSE: To apply posterized edges to an image. # # DESCRIPTION: POSTEREDGES applies posterized edges to an image. The width and # amount of edges may be varied. Color reduction is optional. This script # attempts to duplicate some of the features of Photoshop's Posterized Edges. # # OPTIONS: # # -w width ... WIDTH of the edges. Values are floats>0. The default=3. # # -a amount ... AMOUNT or strength of the edges. Values are floats>0. # The default=5. # # -m method ... METHOD of reducing colors. The choices are: posterize (p) or # colors (c). The default=posterize # # -n number ... NUMBER of reduced colors. Values are integers>=2. The default # is no color reduction. # # -b blur ... BLUR is the blurring (smoothing) of the result. Values are # floats>=0. The default=0.5. # # -s sat ... SAT is the saturation of the result. Values are integers>=0. # The default=100 for no change. # # REQUIREMENTS: IM 6.5.9.3 is required due to the use of -morphology edgeout. # # 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 width=2 # edge width; float>0 amount=5 # edge amount (strength); float>0 method="posterize" # -posterize or -colors; integer>=2 number=0 # number of colors or posterization; integer>=2 blur=0.5 # edge blur; float>=0 sat=100 # saturation amount; integer>=0 # 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 12 ] 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 ;; -w) # get width shift # to get the next parameter # test if parameter starts with minus sign errorMsg="--- INVALID WIDTH SPECIFICATION ---" checkMinus "$1" width=`expr "$1" : '\([0-9]*\)'` [ "$width" = "" ] && errMsg "--- WIDTH=$width MUST BE A NON-NEGATIVE INTEGER ---" test=`echo "$width < 1" | bc` [ $test -eq 1 ] && errMsg "--- WIDTH=$width MUST BE A POSITIVE INTEGER ---" ;; -a) # get amount shift # to get the next parameter # test if parameter starts with minus sign errorMsg="--- INVALID AMOUNT SPECIFICATION ---" checkMinus "$1" amount=`expr "$1" : '\([.0-9]*\)'` [ "$amount" = "" ] && errMsg "--- AMOUNT=$amount MUST BE A NON-NEGATIVE FLOAT ---" ;; -p) # polarity shift # to get the next parameter # test if parameter starts with minus sign errorMsg="--- INVALID POLARITY SPECIFICATION ---" checkMinus "$1" # test gravity values polarity="$1" polarity=`echo "$1" | tr '[A-Z]' '[a-z]'` case "$polarity" in black) ;; white) ;; *) errMsg "--- POLARITY=$polarity IS AN INVALID VALUE ---" esac ;; -b) # get blur shift # to get the next parameter # test if parameter starts with minus sign errorMsg="--- INVALID BLUR SPECIFICATION ---" checkMinus "$1" blur=`expr "$1" : '\([.0-9]*\)'` [ "$blur" = "" ] && errMsg "--- BLUR=$blur MUST BE A NON-NEGATIVE FLOAT ---" ;; -m) # method shift # to get the next parameter # test if parameter starts with minus sign errorMsg="--- INVALID METHOD SPECIFICATION ---" checkMinus "$1" # test gravity values method="$1" method=`echo "$1" | tr '[A-Z]' '[a-z]'` case "$method" in posterize|p) method="posterize" ;; colors|c) method="colors" ;; *) errMsg "--- METHOD=$method IS AN INVALID VALUE ---" esac ;; -n) # get number colors shift # to get the next parameter # test if parameter starts with minus sign errorMsg="--- INVALID NUMBER OF COLORS SPECIFICATION ---" checkMinus "$1" number=`expr "$1" : '\([0-9]*\)'` [ "$number" = "" ] && errMsg "--- NUMBER OF COLORS=$number MUST BE A NON-NEGATIVE INTEGER ---" test=`echo "$number <= 1" | bc` [ $test -eq 1 ] && errMsg "--- NUMBER OF COLORS=$number MUST BE A POSITIVE INTEGER GREATER THAN 1 ---" ;; -) # 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 [ "$outfile" = "" ] && errMsg "NO OUTPUT FILE SPECIFIED" # set up temp files tmpA1="$dir/posteredges_A_$$.mpc" tmpA2="$dir/posteredges_A_$$.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 # get im version im_version=`convert -list configure | \ sed '/^LIB_VERSION_NUMBER */!d; s//,/; s/,/,0/g; s/,0*\([0-9][0-9]\)/\1/g' | head -n 1` # colorspace RGB and sRGB swapped between 6.7.5.5 and 6.7.6.7 # though probably not resolved until the latter # then -colorspace gray changed to linear between 6.7.6.7 and 6.7.8.2 # then -separate converted to linear gray channels between 6.7.6.7 and 6.7.8.2, # though probably not resolved until the latter # so -colorspace HSL/HSB -separate and -colorspace gray became linear # but we need to use -set colorspace RGB before using them at appropriate times # so that results stay as in original script # The following was determined from various version tests using posteredges. # with IM 6.7.4.10, 6.7.6.10, 6.8.0.8 if [ "$im_version" -lt "06070606" -o "$im_version" -gt "06070707" ]; then cspace="RGB" else cspace="sRGB" fi if [ "$im_version" -lt "06070607" -o "$im_version" -gt "06070707" ]; then setcspace="-set colorspace RGB" else setcspace="" fi # no need for setcspace for grayscale or channels after 6.8.5.4 if [ "$im_version" -gt "06080504" ]; then setcspace="" cspace="sRGB" fi # read input image convert -quiet "$infile" $setcspace +repage $tmpA1 || echo "--- FILE $infile DOES NOT EXIST OR IS NOT AN ORDINARY FILE, NOT READABLE OR HAS ZERO SIZE ---" # set up colormode if [ "$im_version" -lt "06070900" ]; then colormode=HSL else colormode=HCL fi # set up blur if [ "$blur" = "0" ]; then blurring="" else blurring="-blur 0x$blur" fi # set up posterize or colors if [ "$number" = "0" ]; then reducecolors="" else reducecolors="+dither -$method $number" fi # process image # 1) open input image # 2) convert to hcl and separate channels # 3) clone L channel and reduce colors # 4) recombine with new L channel # 5) delete unnecessary images # 6) clone original image and convert to grayscale # 7) clone grayscale and apply unsharp masking # 8) subtract unsharp grayscale image from original grayscale image to get edge image, amplify and negate # 9) compose multiply the edge image over the reduced color image and save as output image convert $tmpA1 \ \( -clone 0 -colorspace $colormode -separate +channel \) \ \( -clone 3 $reducecolors \) \ \( -clone 1 -clone 2 -clone 4 -set colorspace $colormode -combine -colorspace $cspace \ -define modulate:colorspace=$colormode -modulate 100,$sat,100 \) \ -delete 1-4 \ \( -clone 0 $setcspace -colorspace gray \) \ \( -clone 2 -unsharp 0x$width \) \ \( -clone 2 -clone 3 +swap -compose minus -composite -evaluate multiply $amount -negate \) \ -delete 0,2,3 -compose multiply -composite $blurring "$outfile" exit 0