I was working recently with actor Andre de Vanny on a promotional image for a show he's working on, Swansong, which opens tonight at the Old Fitz Theatre here in Sydney - and it got me thinking about something that isn't talked about so much in photography, the use of white balance as a creative tool, to control or alter colour in an image.

Sure, there are a number of settings on pretty much any camera bigger than your phone (and even some apps) that let you choose the 'correct' colour that best matches your situation, from daylight to tungsten or fluorescent balance. But of course, lots of times there are many sources in an image - so how do you know which is the the one true white balance for your image?