Shell and GUI parameters
The following parameters can be supplied:
MPImage displays a Gui with a View/Convert gadget to
select the running mode and a Size gadget to select the sizing mode.
It also displays Ok (keyboard shortcut O), Cancel (keyboard
shortcut C) and Help (keyboard shortcut Help).
The Esc key can also be used to cancel the requester. Help can also be
used over/in any of the gadgets to display context sensitive help.