imagemagick

imagemagick, a program that can create, edit, compose or convert graphical information as stored in many different file formats.

imagemagick can resize, flip, mirror, rotate, distort, shear and transform images, adjust image colors, apply various special effects, or draw text, lines, polygons, ellipses and Bézier curves.

Web Site:

https://www.imagemagick.org/script/index.php .

Reference:

1. https://www.imagemagick.org/script/command-line-processing.php
2. Michael Still,
   The Definitive Guide to ImageMagick,
   Apress, 2005,
   ISBN: 978-159-059-5909.

Examples and Tests:

The file balloons_noisy.png contains a lot of speckle noise. We remove most of the noise using the ImageMagick convert command with the "-noise 3" switch. We make versions of the image with just 2, 4, 8 or 16 colors using the "-colors n" switch. We left-right reverse the image with the "-flop" switch.

• balloons_noisy.png, the noisy image file.
• balloons.png, the PNG version, after denoising.
• balloons2.png, the 2 color version.
• balloons4.png, the 4 color version.
• balloons8.png, the 8 color version.
• balloons16.png, the 16 color version.
• balloons_newriver.sh, a script that carries out the image processing on the ARC cluster NewRiver.

append_test: The +append command can be used to concatenate several images in a row, and the -append command does the same in a column. By combining these two commands, we can make a 2x2 table of some of our balloon images.

• append_test.sh, runs the test.
• balloons_row1.png, row 1.
• balloons_row2.png, row 2.
• balloons_table.png, the 2x2 table.

flop_test: The -flop command can be used to left-right reverse an image.

• flop_test.sh, runs the test.
• balloons.png, an image to be reversed.
• snoollab.png, the left-right reversed version.