Image editing with command-line tools
When you want to scale, filter, or transform a number of images in the same way, you don't want to open each file in your preferred graphics editor, apply the transformations, then save the new version of the image. Instead, the entire process is far easier at the command line using ImageMagick [1], which is available in the repositories of all distributions. For example, using the command
$ convert -scale 50% image.jpg small/image.jpg
reduces the height and width of image.jpg by 50 percent and writes the results to a file of the same name in the small subdirectory.
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