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# 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.
(, Fri 17 Apr 2009, 19:17, archived)
# I tried them, doesn't seem to work.
STUPID PHOTOSHOP!!!
(, 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
(, 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.
(, Fri 17 Apr 2009, 19:44, archived)