Fred's ImageMagick Scripts



    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.

    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

CROSSHATCH


Applies a crosshatch effect to an image.

Download Script

last modified: April 25, 2015



USAGE: crosshatch [-l length] [-s sharp ] [-g gain ] [-a amount] [-p prune] [-b balance] [-e effect] [-m mix] [-B bri] [-C con] [-S sat] infile outfile
USAGE: crosshatch [-h|-help]

-l ... length .... length of strokes; integer>=0; default=7
-s ... sharp ..... sharpness; integer>=0; default=10
-g ... gain .......gain (strength) of strokes; integer>=0; default=1
-a ... amount .... edge amount; integer>0; default=1
-p ... prune ..... edge pruning; integer (positive or negative); default=0
-b ... balance ... balance between plus and minus 45 degree diagonal strokes;
.................. -100<=integer<=100; default=0
-e ... effect .... stroke effect; choices are normal(n), light(l) or dark(d);
.................. default=normal
-m ... mix ....... mixing (blend) between original and processing image;
.................. 0<=integer<=100; 0 is original image, 100 is processed
.................. image; default=100 (processed image)
-B ... bri ....... percent change of brightness; positive or negative integer;
.................. default=0
-C ... con ....... percent change of contrast; positive or negative integer;
.................. default=0
-S ... sat ....... percent change of saturation; positive or negative integer;
.................. default=0

PURPOSE: To apply a crosshatch effect to an image.

DESCRIPTION: CROSSHATCH applies a crosshatch effect to an image. Options include: the length, gain, (edge) amount, balance and effect of the stroke.

ARGUMENTS:

-l length ... LENGTH of strokes. Values are integers>=0. The default=7.

-s sharp ... SHARP is the sharpness of image and strokes. Values are integers>=0. The default=10.

-g gain ... GAIN (strength) of strokes. Values are integers>=0. The default=1.

-a amount ... EDGE AMOUNT. Values are integers>0. The default=1.

-p prune ... EDGE PRUNING. Values are integers (positive or negative). Positives remove lighter edges and negatives remove darker edges. The default=0.

-b balance ... BALANCE between plus and minus 45 degree diagonal strokes. Values are -100<=integer<=100. The default=0.

-e effect ... STROKE EFFECT. The choices are normal(n), light(l) or dark(d). The default=normal.

-m mix ... MIX (blend) between original and processing image. Values are 0<=integer<=100. 0 is original image. 100 is processed image. The default=100 (processed image).

-B bri... BRI is the percent change of brightness. Values are positive or negative integers. The default=0.

-C con... CON is the percent change of contrast. Values are positive or negative integers. The default=0.

-S sat... SAT is the percent change of saturation. Values are positive or negative integers. The default=0.

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.


EXAMPLES

Example 1 - Variation In Sharpening

Original

Arguments:
-l 7 -s 0 -g 0 -a 1

Arguments:
-l 7 -s 5 -g 0 -a 1

Arguments:
-l 7 -s 10 -g 0 -a 1

Arguments:
-l 7 -s 20 -g 0 -a 1



Example 2 - Variation In Gain

Original

Arguments:
-l 7 -s 10 -g 1 -a 1

Arguments:
-l 7 -s 10 -g 3 -a 1

Arguments:
-l 7 -s 10 -g 5 -a 1

Arguments:
-l 7 -s 10 -g 10 -a 1



Example 3 - Variation In Amount; Gain = 1

Original

Arguments:
-l 7 -s 10 -g 1 -a 1

Arguments:
-l 7 -s 10 -g 1 -a 2

Arguments:
-l 7 -s 10 -g 1 -a 5

Arguments:
-l 7 -s 10 -g 1 -a 10



Example 4 - Variation In Amount; Gain = 5

Original

Arguments:
-l 7 -s 10 -g 5 -a 1

Arguments:
-l 7 -s 10 -g 5 -a 3

Arguments:
-l 7 -s 10 -g 5 -a 5

Arguments:
-l 7 -s 10 -g 5 -a 10



Example 5 - Variation In Pruning

Original

Arguments:
-l 7 -s 10 -g 1 -a 1 -p -2

Arguments:
-l 7 -s 10 -g 1 -a 1 -p 0

Animation
-l 7 -s 10 -g 1 -a 1 -p 2



Example 6 - Variation In Balance

Original

Arguments:
-l 7 -s 10 -g 1 -a 1 -b -100

Arguments:
-l 7 -s 10 -g 1 -a 1 -b 0

Animation
-l 7 -s 10 -g 1 -a 1 -b 100



Example 7 - Variation In Effect

Original

Arguments:
-l 7 -s 10 -g 1 -a 1 -e dark

Arguments:
-l 7 -s 10 -g 1 -a 1 -e normal

Animation
-l 7 -s 10 -g 1 -a 1 -e light



What the script does is as follows:

  • Applies unsharp masking to sharpen the image using gain and
    amount arguments
  • Applies a linear diagonal blur convolution on the sharpened
    image at each of plus and minus 45 degrees and the desired length
  • Blends the two previous blurred results at the desired balance
  • Applies unsharp masking to that result using the sharp argument
  • Blends the original with the processed image
  • Applies any desired brightness, contrast or saturation

This is equivalent to the following IM commands

  • length=$((2*length+1))
  • convert $infile -unsharp 0x${gain}+${amount}+0 $dir/tmpS.mpc
  • apply diagBlurPlus function to do linear convolution along one diagonal
  • apply diagBlurMinus function to do linear convolution along the other diagonal
  • balance1=`convert xc: -format "%[fx:($balance+100)/2]" info:`
  • balance2=$((100-$balance1))
  • convert $dir/tmpB45.mpc $dir/tmpBm45.mpc -compose blend \
    -define compose:args=$balance2,$balance1 -composite $dir/tmpB.mpc
  • convert $dir/tmpB.mpc -unsharp 0x1+${sharp}+0 $dir/tmpBs.mpc
  • convert $infile $dir/tmpBs.mpc \
    -compose blend -define compose:args=$mix -composite \
    -brightness-contrast $bri,$con -modulate 100,$sat,100 \
    $outfile