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ImageMagick is the tool for transforming images.

The command line mogrify is excellent for changing the size of an image. mogrify -geometry does that, maintaining the image's aspect ratio (the specified width and height are maximum values) append the geometry with an exclamation point to force a change to aspect ratio.

Rotate an image with -rotate

Reduce the colors in an image: mogrify -colors 2 filename

To also dither the image: mogrify -colors 4 -dither filename

Monochrome image: mogrify -monochrome filename

Annotate image: mogrify -comment 'Hi there' filename

Add borders to image (pixel width and height): mogrify -border 2x4 filename

Decorative border: mogrify -frame 20x20 filename

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