> So if my rendering engine offers feature X (e.g. motion blur) it's OK,
> while if I use some other tool such as Photoshop or The Gimp to achieve
> the same, it's not?

Yep, that's right.  This rule isn't so much as a condemnation towards the
aforementioned post processing features as it is an attempt to eliminate
someone from creating an image completely without use of a raytracer or
similar program.   For example, if you had two entries each using feature X,
one done with MP and the other with PS, there is no doubt that the former
had to have used a raytracing program whereas the same is not true for the
later.

-Chris-

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