Quote
Originally posted in Holy hologram!
Anything that looks grainy or is just a poorly done special effect has
the "computer look." Like the "ground effect" around the vehicle
escaping from Jaba's barge (mentioned by Dave Mason above). And things
that were *not* done by computer are mistaken for computer effects. For
instance, the projection of Princess Leia (sic?) from R2D2 in SW. In the
documentary about the movie they *say* they filmed a TV image of her,
and that's what gave it the holographic quality. Yet I still hear
several people referring to that as a computer generated image.
(more at link)

That's a good discussion. I clicked on "Watch this topic".