Nikon D40 - 9/29/2012 - f-5.6 - 1/500 sec - ISO 400 - 82mm eqv.
This image is one that I took of the fall colors, but became bored with the standard pumped colors you see in most photos. I decided to edit it with GIMP to have a old/grunge look. Once I had the BW conversion, I decided that it should have some color, so I reprocessed the raw to give strong colors and dropped it on top of the BW. The new layer is in overlay mode with low opacity, with a duplicate to add a little more to the dirty look.