Sometimes it's useful to be able to quickly combine multiple images into one.1 ImageMagick's montage command does exactly this.

The following command:

montage -tile 1x -geometry 600x+1+1 image1.jpg image2.jpg image3.jpg output.jpg

Will produce an image like:

  1. This is especially useful when posting images to services like Freecycle which only support one product image and also have stringent file size requirements.