© John Magnet Bell
Taken in Eastbourne, 2008. Processed in Braga, Portugal, 2013.
I used Adobe Camera Raw to bring out the rainbow as best I could. This I achieved by playing with the exposure, brightness and contrast settings, and then the curves, for quite a while.
When doing this sort of work, it helps if you pay attention to your spectrogram; if you see clipping on any channel (red, green, blue, white, black), it’s advisable to pull back a little on the settings, unless you’re comfortable with an unprintable photo.
Always shoot in RAW format if you can; chances are, if your camera can shoot RAW, it also came with bundled software that processes RAW files. RAW is immensely useful to photographers.