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# you can copy the difference result and paste it to a new layer
then mess around with the brightness or use a threshold adjustment, and turn it into a selection (ctrl click on its layer thumbnail)

That should select the non-identical areas, for you to do whatever you want with them.
(I helped save b3ta! Bloop Fri 16 Jul, 22:10, Fri 17 Apr 2009, 18:51, archived)
# except you have to click in the channels window not the colour thumbnail.
(I helped save b3ta! Bloop Fri 16 Jul, 22:10, Fri 17 Apr 2009, 18:56, archived)
# The only problem with that is that you still get a black background which you have to select and delete manually and it always seems to give crappy edges.
There doesn't seem to be any way to just either delete identical pixels or select identical pixels. What the fuck photoshop?
(Jeru War and Piss, Fri 17 Apr 2009, 19:04, archived)
# is the quickmask thing any use or does this
specifically need two identical layers?

the crappy edges are because a pixel is either identical or not, feathering the selection or blurring the image might help.
(I helped save b3ta! Bloop Fri 16 Jul, 22:10, Fri 17 Apr 2009, 19:07, archived)
# The quickmask thing does work with lots of steps, but it still has problems around colours and will delete all blacks not just the black from the difference blend.
Pretty sure that method wouldn't work for video though. But I swear I've heard people extracting the backgrounds from videos purely by having a static shot clear from any people/objects, as an easy alternative to green screen, so how the fuck did they do it then?
(Jeru War and Piss, Fri 17 Apr 2009, 19:14, archived)
# There are add and subtract blending options hidden somewhere.
In the "apply image" and "calculations" commands. Just reading about this in the help. Might do the job somehow. Or not.
(_Felix 's school of dance and occult sciences, Fri 17 Apr 2009, 19:17, archived)
# I tried them, doesn't seem to work.
STUPID PHOTOSHOP!!!
(Jeru War and Piss, Fri 17 Apr 2009, 19:19, archived)
# think i get what you're after now
I'll have a go and see if I can work it out
(I helped save b3ta! Bloop Fri 16 Jul, 22:10, Fri 17 Apr 2009, 19:23, archived)
# Ahhh it's called difference masking when you do it for video, that's helped finding a lot of tutorial links.
(Jeru War and Piss, Fri 17 Apr 2009, 19:44, archived)