GNU/Linux Desktop Survival Guide by Graham Williams
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ImageMagick

20190629 ImageMagick is a command line tool for transforming images. By combining digital image processing operations as a series of commands it provides a powerful ability to build image processing pipelines which can then be easily repeated. In contrast, graphical interfaces can sometimes become a burden, often requiring fiddly and manual interactions that do not have the precision and repeatability offered by ImageMagick.

ImageMagick provides the following commands:

• animate
• compare
• composite
• conjure
• convert: process the image and/or convert between formats;
• display: view the image
• identify
• import
• mogrify: process the image in place - list the image last on the command line;
• montage

Common operations include resize, blur, crop, despeckle, dither, draw on, flip, join, re-sample, and much more.

The basic command line will look something like the following which takes an input image file, resizes it to 25% of the original size, converts black to white, and writes the resulting image to the output file:

$ convert input.jpg -resize 25% -fill white -opaque black output.jpg

ImageMagick Tricks, by Sohail Salehi, 230 pages published by PACKT Publishing, 2006, ISBN 1904811868, available from http://www.packtpub.com/imagemagick/book, is a useful guide to using ImageMagick. It provides a tutorial like presentation illustrating many trick and tips.