@DjAlexDubCheck
I blended the pictures using an XOR filter.
A "Difference" filter would've worked too, and would've looked like this:
Difference works well here because manga use mostly black and white.
The difference between white (255) and black (0) is also white (255).
However, it doesn't work very well for similar colors. For instance, gray (128) and dark gray (100) would result in near-black (28).
XOR can make even slight differences very obvious. In the case of gray (128) and dark gray (100) the result would've been near-white (228). That's why I prefer XOR.