align_image_stack(1) on Linux
The text 1063c4b0ab41, as Debian 7 (Wheezy) shipped it.
Align overlapping images for HDR or focus stack creation
Flags it lists
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-e -
-f -
-g -
-h -
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-l -
-m -
-o -
-p -
-s -
-t -
-v