align_image_stack(1) on Linux
The text 7b77ed9154c8, as Debian 5.0 (Lenny) shipped it.
Align overlapping images for HDR or focus stack creation
Flags it lists
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-a -
-c -
-e -
-f -
-g -
-h -
-l -
-m -
-o -
-p -
-s -
-t -
-v