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

TILTSHIFT


Applies a tiltshift effect to an image

Download Script

last modified: September 26, 2017



USAGE: tiltshift [-m mode] [-s size] [-b blur] [-B brightness] [-C contast] [-S saturation] infile outfile
USAGE: tiltshift [-help|-h]

-m ... mode ......... mode of tiltshift; choices are: vertical (v),
..................... horizontal (h), elliptical (e) and circular (c);
..................... default=vertical
-s ... size ......... size of central unblurred area; -100<=integer<=100;
..................... default=0 (no change from default amount)
-b ... blur ......... blur amount for outer area; float>=0; default=5
-B ... brightness ... brightness change of image; -100<=integer<=100;
..................... default=0 (no change)
-C ... contrast ..... contrast change of image; -100<=integer<=100;
..................... default=0 (no change)
-S ... saturation ... saturation change of image; -100<=integer<=100;
..................... default=0 (no change)

PURPOSE: Applies a tiltshift effect to an image.

DESCRIPTION: TILTSHIFT applies a tiltshift effect to an image. There are optional modes including: vertical, horizontal, elliptical and circular

ARGUMENTS:

-m mode ... MODE of the tiltshift effect. The choices are: vertical (v), horizontal (h), elliptical (e) and circular (c). The default=vertical.

-s size ... SIZE of the central unblurred area relative to a default amount. Values are -100<=integers<=100. The default=0.

-b blur ... BLUR amount for the outer area. Values are floats>=0. The default=5.

-B brightness ... BRIGHTNESS change of the image. Values are -100<=integers<=100. The default=0 (no change).

-C contrast ... CONTRAST change of the image. Values are -100<=integers<=100. The default=0 (no change).

-S saturation ... SATURATION change of the image. Values are -100<=integers<=100. The default=0 (no change).

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 -- Vertical Mode -- Variation in Size
(Taken by Anthony Thyssen)

 

Original

 

Arguments:
-m vertical -s -25 -B 50 -C 20

 

Arguments:
-m vertical -s 0 -B 50 -C 20

 

Arguments:
-m vertical -s 75 -B 50 -C 20


Example 2 -- Horizontal Mode -- Variation in Size
(Taken by Anthony Thyssen)

 

Original

 

Arguments:
-m horizontal -s -25 -B 50 -C 20

 

Arguments:
-m horizontal -s 0 -B 50 -C 20

 

Arguments:
-m horizontal -s 75 -B 50 -C 20


Example 3 -- Elliptical Mode -- Variation in Size
(Taken by Anthony Thyssen)

 

Original

 

Arguments:
-m ellipse -s -25 -B 50 -C 20

 

Arguments:
-m ellipse -s 0 -B 50 -C 20

 

Arguments:
-m ellipse -s 75 -B 50 -C 20


Example 4 -- Circular Mode -- Variation in Size
(Taken by Anthony Thyssen)

 

Original

 

Arguments:
-m circle -s -25 -B 50 -C 20

 

Arguments:
-m circle -s 0 -B 50 -C 20

 

Arguments:
-m circle -s 75 -B 50 -C 20


What the script does is as follows:

  • Creates either a vertical or horisontal gradient that is solarize to reflect it
    or an elliptical or circular gradient to be used as a mask
  • Enhances the image in brightness, contrast and/or saturation
  • Blurs the enhanced image
  • Uses the gradient mask to composite the two previous images

This is equivalent to the following IM commands for the case of mode=vertical:

  • convert -quiet -regard-warnings "$infile" +repage "$tmpA1"
  • ww=`identify -ping -format "%w" $tmpA1`
  • hh=`identify -ping -format "%h" $tmpA1`
  • dim=`convert xc: -format "%[fx:min($ww,$hh)]" info:`
  • convert -size ${ww}x${hh} gradient: -solarize 50% -level 0x50% -negate $tmpA2
  • bright=`convert xc: -format "%[fx:$bright+100]" info:`
  • sat=`convert xc: -format "%[fx:$sat+100]" info:`
  • contr=`convert xc: -format "%[fx:(2/10)*abs($contr)]" info:`
  • test=`convert xc: -format "%[fx:abs($contr)<0.0001?0:($contr>0?1:-1)]" info:`
  • if [ $test -eq 1 -o $test -eq 0 ]; then
    sign="-"
    elif [ $test -eq -1 ]; then
    sign="+"
    fi
  • test=`convert xc: -format "%[fx:$size<1?0:1]" info:`
  • if [ $test -eq 1 ]; then
    size=`convert xc: -format "%[fx:-0.0099*$size+1]" info:`
    elif [ $test -eq 0 ]; then
    size=`convert xc: -format "%[fx:-0.09*$size+1]" info:`
    fi
  • convert \( $tmpA1 -modulate $bright,$sat,100 ${sign}sigmoidal-contrast ${contr},50% \) \
    \( -clone 0 -blur 0x$blur \) \
    \( $tmpA2 -gamma $size \) \
    $setcspace -compose over -composite $outfile