I think this forum post (with still working image inserts) illustrates what Andrea trying to do inside CinGG:
On input image a bit blown out, but after few layers of correction (_as long as you editing software does not clip to 1.0_) you get more details, in final image.
Very unavoidable fact that _everything_ (camera, monitor, projector, printer, eyes) all non-linear in their transmission/sensing/emitting lightwaves of different frequencies makes all this quite complex topic!