Drag all picture files into the window to load them
Tab to swtich sorting modes
Enter to start filtering
Del to generate batch commands which can delete all marked pictures, you need execute the commands manually
Space to sort pictures immediately (not neccessary, sorting will be done automatically when entering filter mode)
Ctrl + Del to clear the explorer
All picture pairs which has similar value of crrent sorting mode will be listed
Left (Right) to mark the picture at the left (right) to be deleted later
Enter to back to Explorer mode