Licensing:

Copyright © Fred Weinhaus

My scripts are available free of charge for non-commercial (non-profit) 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.

Usage, whether stated or not in the script, is restricted to the above licensing arrangements. It is also subject, in a subordinate manner, to the ImageMagick license, which can be found at: http://www.imagemagick.org/script/license.php

Please read the Pointers For Use on my home page to properly install and customize my scripts.

Example 1 -- Variation in Blur

Original
(source)

Arguments:
-b 1 -t 10 -e none -q 0

Arguments:
-b 4 -t 10 -e none -q 0

Arguments:
-b 16 -t 10 -e none -q 0

Example 2 -- Variation in Threshold

Original
(source)

Arguments:
-b 4 -t 5 -e none -q 0

Arguments:
-b 4 -t 10 -e none -q 0

Arguments:
-b 4 -t 20 -e none -q 0

Example 3 -- Variation in Edge

Original
(source)

Arguments:
-b 4 -t 10 -e DoG -q 0

Arguments:
-b 4 -t 10 -e LoG -q 0

Arguments:
-b 4 -t 10 -e sobel -q 0

Arguments:
-b 4 -t 10 -e canny -q 0

Example 4 -- Variation in Edge with Quantization

Original
(source)

Arguments:
-b 4 -t 10 -e DoG -q 8 -s 2

Arguments:
-b 4 -t 10 -e LoG -q 8 -s 2

Arguments:
-b 4 -t 10 -e sobel -q 8 -s 2

Arguments:
-b 4 -t 10 -e canny -q 8 -s 2

Example 5 -- Variation in Edge with Quantization

Original
(source)

Arguments:
-b 4 -t 10 -e DoG -q 8 -s 1 -B 20 -S 10

Arguments:
-b 4 -t 10 -e LoG -q 8 -s 1 -B 20 -S 10

Arguments:
-b 4 -t 10 -e sobel -q 8 -s 1 -B 20 -S 10

Arguments:
-b 4 -t 10 -e canny -q 8 -s 1 -B 20 -S 10

Example 6

Original

Arguments:
-b 4 -t 10 -e sobel -q 8 -s 2

Example 7

Original
(source)

Arguments:
-b 4 -t 10 -e sobel -q 8 -s 1

What the script does is as follows:

• Converts the input to LAB colorspace
• Applies selective-blur to the luminance channel
• Optionally clones the smoothed luminance channel and extracts edges
• Optionally color quantizes the smoothed luminance channel
• Replaces the old luminance channel with the smoothed one,
  deletes the old one, combines channels and converts to sRGB
• Optionally applies the edges to the image

This is equivalent to the following IM commands

• convert -quiet "$infile" $tmpA
• if [ "$saturation" = "0" ]; then
  satproc=""
  else
  loval=$saturation
  hival=$((100-saturation))
  satproc="-level ${loval}x${hival}%"
  fi
• if [ "$brightness" = "0" -a "$contrast" = "0" ]; then
  bcproc=""
  else
  bcproc="-brightness-contrast ${brightness},${contrast}"
  fi
• if [ "$edge" = "dog" ]; then
  [ "$gain" = "" ] && gain=20
  edgeproc="-define convolve:scale=!$gain -morphology convolve DoG:0,0,1 -negate"
  elif [ "$edge" = "log" ]; then
  [ "$gain" = "" ] && gain=15
  edgeproc="-define convolve:scale=!$gain -morphology convolve LoG:0,1 -negate"
  elif [ "$edge" = "sobel" ]; then
  [ "$gain" = "" ] && gain=4
  edgeproc="-define convolve:scale=!$gain -define morphology:compose=Lighten \
  -morphology Convolve Sobel:> -negate"
  elif [ "$edge" = "canny" ]; then
  edgeproc="-canny 0x1+${lothresh}+${hithresh}% -negate"
  fi
• if [ "$smoothing" = "0" ]; then
  smoothproc=""
  else
  smoothproc="-blur 0x$smoothing"
  fi
• convert -respect-parenthesis $tmpA -colorspace LAB -separate +channel \
  \( -clone 0 -selective-blur 0x${blur}+${threshold}% $bcproc \) \
  \( -clone 3 $edgeproc \) \
  \( -clone 3 +dither -colors $quantize $smoothproc \) -swap 3,5 +delete \
  \( -clone 2 -clone 1 $satproc -clone 3 -reverse -set colorspace LAB -combine -colorspace sRGB \) \
  -delete 0-3 -compose multiply -composite \
  "$outfile"