If you are unfamiliar with Before and After Magazine, here is a blurb from their site…
“Before & After magazine has been sharing its practical approach to graphic design since 1990. Because our modern world has made designers of us all (ready or not), Before & After is dedicated to making graphic design understandable, useful and even fun for everyone.”
To further their efforts, Before & After produces a series of downloadable tutorials on various design related subjects. Most of them require a paid subscription to access, but occasionally they put out one for free. Todays free issue deals with color, and how you can change the look of a photograph, by surrounding it with a different color palette.
You can also still access a couple of the previous free downloads from the home page.
Link: How to cool a hot photo