#!/bin/bash # # Developed by Fred Weinhaus 3/13/2008 .......... revised 4/25/2015 # # ------------------------------------------------------------------------------ # # 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: gaussian [-w width] [-k kind] [-m mix] infile outfile # USAGE: gaussian [-h or -help] # # OPTIONS: # # -w width width for Gaussian blur filter; # See sigma in -blur; float > 0; # default=1 # -k kind kind=high or low (pass filter) or edge; # default=high # -m mix mixing percent with original image; # mix=integer 0 to 100; default=20 # -h get help information # -help get help information # ### # # NAME: GAUSSIAN # # PURPOSE: To generate high pass or low pass filtered images based upon # a Gaussian shaped convolution. # # DESCRIPTION: GAUSSIAN generates an output image which is a user defined # mix or blend of the original image and a Gaussian blurred version of the # image. # # The basic blended low pass filtering formula is F = (1-m)*I + m*L, where I is # the original image, L is the Gaussian low pass filtered image and m = mix/100. # When m=0, we get only the original image and when m=1, we get only the low pass # Gaussian filtered image. For intermediate value of m, we get a blend of the # image and the Gaussian low pass filtered image. For high pass filtering, we # form the high pass filter by subtracting the low pass filter from the original # Thus in the formula above L is replaced by H=(I-L), and as the high pass image # is primarily black we simply add the percentage of the high pass image to the # original image so that F = I + m*H, which also can be expressed as # F = (1+m)*I - m*L. For the edge image, we simply output the high pass filtered # image so tht F=H. # # # OPTIONS: # # -w width ... WIDTH is the (half) width for the Gaussian blurring # (low pass) convolution filter. This corresponds to sigma for the -blur # IM function with radius set to 0 so that it is determined automatically. # Width is a positive floating point value. Default=1. See the function # -blur in the IM documentation. # # -k kind ... KIND is the kind of filter, either a high pass, low pass filter # or edge image are allowed. Thus kind=high, low or edge. The default=high. # A low pass filter will cause blurring. A high pass filtered image will # produce either sharpening and the edge option will extract edges. See below. # # -m mix ... MIX is the percentage mixing factor to use to blend the filtered # result with the original image. For kind=low, a value of mix=0, results in # the original image and a value of mix=100 results in a pure low pass filtered # image. For low pass filtering, a larger value for mix will produce more blurring. # For kind=high, the mix percentage of the high pass filtered image will be # added to the original image. A larger value for mix will sharpen or highlight # the edges more. Fr kind=edge, the mix value is not relevant or is ignored. # The default is mix=20. # # 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 params width=1 mix=20 kind="high" # 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 [ $# -eq 3 -o $# -eq 5 -o $# -eq 7 -o $# -gt 8 ] 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 - radius,sigma # test if parameter starts with minus sign errorMsg="--- INVALID WIDTH SPECIFICATION ---" checkMinus "$1" width=`expr "$1" : '\([.0-9]*\)'` [ "$width" = "" ] && errMsg "--- WIDTH=$width IS NOT VALID ---" widthtest=`echo "$width <= 0" | bc` [ $widthtest -eq 1 ] && errMsg "--- WIDTH=$width MUST BE A POSITIVE INTEGER ---" ;; -k) # get kind shift # to get the next parameter - kind # test if parameter starts with minus sign errorMsg="--- INVALID KIND SPECIFICATION ---" checkMinus "$1" kind="$1" # test width values [ "$kind" != "low" -a "$kind" != "high" -a "$kind" != "edge" ] && errMsg "--- KIND=$kind IS NOT A VALID VALUE ---" ;; -m) # get mix shift # to get the next parameter - mix # test if parameter starts with minus sign errorMsg="--- INVALID MIX SPECIFICATION ---" checkMinus "$1" # test mix values mix=`expr "$1" : '\([0-9]*\)'` [ "$mix" = "" ] && errMsg "--- MIX=$mix MUST BE AN INTEGER ---" mixtestA=`echo "$mix < 0" | bc` mixtestB=`echo "$mix > 100" | bc` [ $mixtestA -eq 1 -o $mixtestB -eq 1 ] && errMsg "--- MIX=$mix MUST BE AN INTEGER BETWEEN 0 AND 100 ---" ;; -) # 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 [ "$outfile" = "" ] && errMsg "--- NO OUTPUT FILE SPECIFIED ---" tmpA="$dir/gaussian_$$.mpc" tmpB="$dir/gaussian_$$.cache" tmp0="$dir/gaussian_0_$$.miff" trap "rm -f $tmpA $tmpB $tmp0;" 0 trap "rm -f $tmpA $tmpB $tmp0; exit 1" 1 2 3 15 trap "rm -f $tmpA $tmpB $tmp0; 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 gaussian. # with IM 6.7.4.10, 6.7.6.10, 6.7.8.10 # Note: blend does not work right in IM 6.7.8.9 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 [ "$im_version" -gt "06080504" ]; then setcspace="" fi if convert -quiet "$infile" +repage "$tmpA" then : 'do nothing' else errMsg "--- FILE $infile DOES NOT EXIST OR IS NOT AN ORDINARY FILE, NOT READABLE OR HAS ZERO SIZE ---" fi #process the image if [ "$kind" = "low" ] then convert $tmpA -blur 0x$width $tmp0 if [ "$im_version" -lt "06050304" ]; then composite -blend $mix% $tmp0 $tmpA $outfile else convert $tmpA $tmp0 -define compose:args=$mix% -compose blend -composite "$outfile" fi elif [ "$kind" = "high" ] then convert $tmpA \( $tmpA -blur 0x$width \) -compose minus +swap -composite $setcspace -normalize $tmp0 if [ "$im_version" -lt "06050304" ]; then composite -blend $mix%x100% $tmp0 $tmpA "$outfile" else convert $tmpA $tmp0 -define compose:args=$mix%x100% -compose blend -composite "$outfile" fi elif [ "$kind" = "edge" ] then convert $tmpA \( $tmpA -blur 0x$width \) -compose minus +swap -composite $setcspace -normalize "$outfile" fi exit 0