hi BB,

I just put both images in Photoshop - Difference Blending mode, and adjusted with full brightness (+150) full contrast (-50). Good example.

Still thinking out loud, why should SM advice single thread mode against flickering? It might be justified.

Just for the sake of it: did you render both single threaded? As it might be the case that the random generator starts with the same seed every image, and after that every thread goes its own way sort of independantly (thread 2 won't start always at the same timing diff from thread 1 etc), which might result in having no flickering between images when running both single threaded (same start seed + single thread=repeatable monte carlo process).

that's a 3x "might", i know.

- - - - - 

Usually I'm wrong. But to be effective and efficient, I don't need to be correct or accurate.

visit www.aRtBeeWeb.nl (works) or Missing Manuals (tutorials & reviews) - both need an update though