Fred's ImageMagick Scripts



 

 

MIRRORIZE


Creates a mirror effect in an image.

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last modified: May 30, 2008



USAGE: mirrorize [-r region] infile outfile
USAGE: mirrorize [-h or -help]

-r ..... region ...... region of image to be mirrored;
...................... half image values: North, South, East, West;
...................... image quadrant values: NorthWest, NorthEast,
...................... SouthWest, SouthEast; Default=West

PURPOSE: To create a mirror effect in an image.

DESCRIPTION: MIRRORIZE creates a mirror effect in an image by mirroring any half-image to create the other half or by mirroring any image quadrant to create the other quadrants.

ARGUMENTS:

-r region ... REGION is the region to be mirrored. This can be any half image specified as North, South, East or West. It can also be any image quadrant specified as NorthWest, NorthEast, SouthWest or SouthEast. The default is West.

NOTE: if the image has any odd dimension, then after the mirrorizing, the output image will be one pixel smaller in that dimension.

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


Image Mirrorize
http://www.cescg.org/CESCG97/boros/

Original

Arguments:
-r West

Arguments:
-r East

Arguments:
-r North

Arguments:
-r South

Arguments:
-r NorthWest

Arguments:
-r NorthEast

Arguments:
-r SouthWest

Arguments:
-r SouthEast



What the script does is as follows:

  • Takes one half or one quadrant of an image
  • Flips, Flops, Rotates 180 as needed
  • Appends the sections together

This is equivalent to the following IM commands for mirrorize of the West half of the image.

  • ww=`convert $infile -format "%w" info:`
  • hh=`convert $infile -format "%h" info:`
  • ww2=`convert $infile -format "%[fx:floor(w/2)]" info:`
  • hh2=`convert $infile -format "%[fx:floor(h/2)]" info:`
  • convert $infile[${ww2}x${hh}+0+0] \( +clone -flop \) +append $outfile