Need to quickly and easily crop a photo or image? Just open it up in Preview. Choose the Select tool and select the area. Then choose Tools, Crop or use Command+K. Save the file, or save it using File, Save As to save it as a new image. Handy for quickly making icons for Facebook or Twitter.
Related: Convert PDFs to Images With Preview, Quick Look to iPhoto, Safari Upload Browse Button, Preview Magnifier, Cropping a movie in iMovie 09.

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