Walt--I use the Canon software that comes with the Rebel. It enables you to adjust all parameters of an image by manipulating graph lines and slop functions for each color represented. The interesting effects come when you combine the lines (or function curves) in to the final image.
Gosh Brian I did comment yesterday but it must be in cyberspace somewhere...or it could be the wee possibility I forgot to click 'post comment' :) I love the colors... and the connection made in your caption. Does the vine produce edible grapes?
No edible grapes, I'm afraid. They berries are very small--about half the size of small blueberries. I've never tried a taste. Perhaps I could make small batches of my own vintage from them!