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I find FastStone Image Viewer a useful freeware to compare 2 images side by side, by selecting the images (by holding down Ctrl and clicking) in its Browser view, then pressing P.

Is there a command-line option to directly compare images as above? e.g. something like

"C:\Program Files\FastStone Image Viewer\FSViewer.exe" "D:\image1.jpg" "D:\image2.jpg"
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FastStone is great, but I don't think it has any command-line options. If you really need to do this, you'd be better off using something else. –  benshepherd Oct 5 '12 at 12:32

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