| -h | Prints usage information. |
| -v | Verbose output. |
| -b | Ordered breadth-first search, darkest images first, default. |
| -d | Unordered depth-first search. |
| -t | Set maximum translation values, default 30,30. One input value implies equal maximum shift in x & y directions. |
| -p | Percent of pixels match, default 10. Higher is better but slower. |
| -g | Attempt to reset mean grey values to be equal within matched regions, default. |
| -G | Switch off grey-level matching. |
| -T | Threshold the input images e.g. to remove spurious lines around the edge. |