Histograms – An Aid to Checking Exposure
In basic terms, a histogram is a two-dimensional graph, often resembling a range of mountain peaks, that represents an image’s tonal extent. Whilst, at first glance, histograms might appear quite complex and confusing, they are actually very simple to read. They are an essential aid for digital SLR photographers striving to achieve consistently correct exposures in-camera and are a more accurate method of assessing exposure than looking at images you’ve taken on the LCD monitor.