And here is an example of use:
align_image_stack -a "aligned" -i -P -C left.jpg right.jpg composite -stereo 0 aligned0000.tif aligned0001.tif anaglyph.jpg
And here is an example of use:
align_image_stack -a "aligned" -i -P -C left.jpg right.jpg
composite -stereo 0 aligned0000.tif aligned0001.tif anaglyph.jpg