[PD] unclamped pix_subtract?

Spencer Russell spencer.f.russell at gmail.com
Mon Jul 14 23:08:08 CEST 2008

I'm trying to implement a background subtractor using pix_buffer to
store the reference frame, and then subtracting it from the live video
input, then using that subtraction as an alpha mask for the live
video. The problem is that pix_subtract clamps the output at 0, but I
need it to not clamp, and then I can take the absolute value. Is there
a way to do unclamped subtraction of pix objects in GEM?


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