EXCERPT:
"A histogram is a useful tool for helping you analyze, at a glance, how the information and exposure data in a photograph is distributed. It shows the luminosity range of the image along with how it is distributed...
"The first thing we need to watch for is clipping. A warning sign of clipping is when you have anything resembling a peak at either end of the histogram. Remember: the taller the bar the more data is at a specific level of luminosity. Unless there are detail-free areas of black or white in significant size in the photograph it is likely that your exposure setting (aperture + shutter speed + ISO setting) is destroying ('clipping') the differences that define detail at the extremes of your exposure. That can be a problem for wedding photographers."
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