I find rainbows incredibly difficult to take as they pop up without warning in the most unlikely setting. I was driving along the highway and I saw this rainbow. So I stopped to take a quick picture. I think I overdid the processing in an age without colour correction and certainly with no photoshop sophistication. Must re-process this image.
Canon EOS 30D
Sigma 24-70mm F-2.8 EX DG 45mm
f/8 1/400th ISO 100 Aperture Priority