basic's image may look worse after GC due to shaders containing GC nodes, as it appears to be
desaturated after GC.
however, this is something I also noticed with "VSS for dummies" tutorial - it looked relatively
desaturated on my monitor after everything was applied, than before it was applied.  however,
said tutorial is an excellent site that collects pertinent info in one convenient page.

p.s. poser 8 writes pz3 file with variables gamma (default 1.000000) and usegamma (default 0).
these can be changed to 2.2 and 1, and they aren't reset to default on loading pz3 file, but it has
no effect on the render.