#!/bin/bash # # Developed by Fred Weinhaus 9/4/2016 .......... revised 9/4/2016 # # ------------------------------------------------------------------------------ # # 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: maxrgb infile outfile # USAGE: maxrgb [-h|-help] # ### # # NAME: MAXRGB # # PURPOSE: Converts an RGB image to keep only the channel with the maximum value at each pixel. # # DESCRIPTION: MAXRGB generate a new image that for each pixel keeps the # maximum value of each of the RGB channels of an RGB image and zeroes the # other two channels. The mathematics are: # For each pixel in the image I: # Grab the r, g, and b pixel intensities located at I[x, y] # Determine the maximum value of r, g, and b: m = max(r, g, b) # If r < m: r = 0 # If g < m: g = 0 # If b < m: b = 0 # Store the r, g, and b values back in image: I[x, y] = (r, g, b) # # REQUIREMENTS: Input must be RGB colorspace. # # REFERENCES: # http://docs.gimp.org/en/plug-in-max-rgb.html # http://www.pyimagesearch.com/2015/09/28/implementing-the-max-rgb-filter-in-opencv/ # # 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 directory for temporary files # tmpdir="/tmp" tmpdir="." # 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 } # test for correct number of arguments and get values if [ $# -eq 0 ] then # help information echo "" usage2 exit 0 else while [ $# -gt 0 ] do # get parameter values case "$1" in -h|-help) # help information echo "" usage2 exit 0 ;; -) # 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 [ "$outfile" = "" ] && errMsg "NO OUTPUT FILE SPECIFIED" dir="$tmpdir/MAXRGB.$$" mkdir "$dir" || errMsg "--- FAILED TO CREATE TEMPORARY FILE DIRECTORY ---" trap "rm -rf $dir; exit 0" 0 trap "rm -rf $dir; exit 1" 1 2 3 15 # read input image convert -quiet "$infile" $dir/tmpI.mpc || echo "--- FILE $infile DOES NOT EXIST OR IS NOT AN ORDINARY FILE, NOT READABLE OR HAS ZERO SIZE ---" # get max of R,G,B channels convert $dir/tmpI.mpc -separate +channel +write $dir/tmpS.mpc -evaluate-sequence max $dir/tmpM.mpc # get subtraction masks for each channel and threshold to binary so that if R