Mousetrap.bind('d', function() { change_exposure(-1); });
Mousetrap.bind('x', mark_deleted);
Mousetrap.bind('X', mark_not_deleted);
Mousetrap.bind('d', function() { change_exposure(-1); });
Mousetrap.bind('x', mark_deleted);
Mousetrap.bind('X', mark_not_deleted);