ImageMagick

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ImageMagick is a set of command-line programs for handling images. It is free, open-source software included with most Linux distros; it is also available for Microsoft Windows.

ImageMagick consists of the following programs:

convert converts between image formats as well as applying the following effects: resize, blur, crop, despeckle, dither, draw on, flip, join, re-sample, and much more.
identify describes the format and characteristics of one or more image files
mogrify is essentially the same as convert except that it overwrites the original file (convert writes its output to a new file).
composite overlaps one image over another.
montage creates a composite image by combining several separate images. The images are tiled on the composite image, optionally adorned with a border, frame, image name, and more.
compare mathematically and visually annotates the difference between an image and its reconstruction
display displays an image or image sequence on any X server.
animate animates an image sequence on any X server.
import saves any visible window on an X server and outputs it as an image file. You can capture a single window, the entire screen, or any rectangular portion of the screen.
conjure interprets and executes scripts written in the Magick Scripting Language (MSL).