ImageMagick takes a string with several options when cropping an image. See the command line options for how to provide the expected image geometry Show archive.org snapshot for details.

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Note that ImageMagick tends to preserve the original aspect ratio of the source image automatically.

Examples:

• crop 200x200 means Maximum values of height and width given, aspect ratio preserved.
• crop 200x200! means Width and height emphatically given, original aspect ratio ignored.