Batch resize images in OS X

There is a nice little tool available in the OS X Terminal to batch resize images called sips.
Simply execute:

sips -Z 1024 *.jpg

This command will resize all images ending on .jpg in the current folder to a maximum size of 1024 pixels by maintaining the aspect ration. That means that landscape images will have a width of 1024 pixels and portrait images will have a height of 1024 pixels.

ATTENTION: Note that this command will replace your original images. Use the additional --out flag to specify an optional output directory.

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