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When an image is rotated by convert -rotate command the image size is enlarged. Is there a way to rotate around the center and to keep the image size, cropping the edges?
566
A rotation is a type of transformation which is a turn. A figure can be turned clockwise or counterclockwise on the coordinate plane. In both transformations the size and shape of the figure stays exactly the same.
There are a few different ways that you can rotate an image in Photoshop without rotating the canvas. One way is to go to Image > Image Rotation > 180. This will rotate the image clockwise by 180 degrees. Another way is to go to Edit > Transform > Rotate 90 CW.
convert image.jpg -distort SRT -45 rotate_cropped_image.png
See http://www.imagemagick.org/Usage/warping/#animations
Example: 
See also help on -distort: http://www.imagemagick.org/script/command-line-options.php?#distort
90
This seems now to simply "just work" -- for counter-clockwise 90 degrees:
$ convert image.jpg -rotate -90 rotated_ccw.jpg
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