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command-line syntax and programming APIs remain entirely upward compatible with ImageMagick 5.5.2

maintains a stable source repository with complete version history so that changes are controlled

maintains a detailed ChangeLog

maintains a stable release branch

more time has been spent optimizing and debugging its code

dramatically fewer dependencies on external libraries

much smaller than ImageMagick

installation footprint is 3-5X smaller than ImageMagick

usually faster than ImageMagick

more efficient at dealing with large images

GraphicsMagick has been significantly updated to use multiple CPU cores to speed up the image processing

non-parallelizable code paths often dominating the time

multi-threaded