If you pull down "Untitled" at the top, it should be in that menu?
Regarding your photo, try this and see how it looks. It looks fine when I try it, but I'm only working with a web-size image, so you'll need to examine your file very closely.
A Channel Mixer layer on "Difference" blend mode at about 30% opacity, with these settings:
R 0, 0, +100, 0
G 0, 0, +70, 0
B 0, 0, +30, 0
See what you think.