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I can easily crop a photo to the right dimensions or use an online tool, but I need to make it into a 4x6 because CVS charges $0.25 for a 4'' x 6'' but they charge $12.99 with a coupon for a 2'' x 2''.

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One method is to use montage, from graphicsmagisk,

apt-get install graphicsmagick-imagemagick-compat

Then you can simply supply the same file name multiple times followed by the geometry.

montage cropped.jpg cropped.jpg cropped.jpg cropped.jpg cropped.jpg cropped.jpg -geometry +2+3 out.jpg

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