Image sets:

First, you need to define the image sets you would like to compare.

Each set is defined by a pair (directory,suffix), where the directory is the input directory to look for image files (usually jpeg or png files), and the suffix is the suffix at the end of the file used to define the set.

Key events:

Key_N is the one of the keys 0 to 9

ALT+Key_N switch temporarily to resulting image number N while the key is pressed
ALT+CTL+Key_N switch to image number N as the reference image
CTL+Key_N computes and displays difference between reference image and resulting image number N
h toggle (display/hide) histogram display
c toggle (display/hide) cursor display
F11 toggle fullscreen, can be used for the main window or the image viewer
ALT++ move to next row (seems broken)
ALT+- move to previous row (seems broken)
ALT+A:
select upper left quarter crop
ALT+B
select upper right quarter crop
ALT+C
select lower left quarter crop
ALT+D select lower right quarter crop
ALT+V
Vertical crop top: Horizontal reduction by 2
ALT+H
Horizontal crop: Vertical reduction by 2
ALT+F
select full image geometry
CTL+C  copy text from the table
F1  launch beyond compare on results
F3  launch  faststone on results