v.nor single stream: do a bit-wise NOR operation on each pixel's brightness dual stream: do a bit-wise NOR between the pixel brightnesses of two streams single stream: do a bit-wise NOR operation on each pixel's brightness dual stream: do a bit-wise NOR between the pixel brightnesses of two streams In single stream mode, v.nor calculates the bitwise NOR of the each pixel of stream 1 and an integer. In dual stream mode, v.nor NORs each pixel in stream 1 with the corresponding pixel in stream 2. This is most useful when the two streams are the result of comparison objects (i.e. v.>) which output 0 or 255, meaning that the bit-wise NOR effectively operates as a logical NOR in that case.

from the library : softVNS Format : External Environment : jitter / max commercial Max 4.x http://homepage.mac.com/davidrokeby/softVNS.html