But if there something to skew your colours, like fluorescent or tungsten lights for example, or you are pushing your image creatively, then you might want to make adjustments to offset this. I have done a quick demo of each so you can see the effects, first, Auto:And here are each of the other options:From top left to bottom right: Cloudy, Daylight, Flash, Fluorescent, Shade and Tungsten. Their names are indicative of what is being offset, so for example both Cloudy and Shade will be assuming darker, greyer days and so shift towards warmer tones.
Looking at my histogram, you can see the information is fairly nicely spread across the whole graph, but with most of the data grouped into the shadows and midtones section. If we saw a large peak at either end of the image, we would know….