A histogram is a chart that represents the distribution of pixels in each image. It is visible on the rear LCD screen during Live View shooting, or during playback, and is a very useful way to evaluate exposure. Histograms are sort of mountain-shaped; the height of each peak indicates how many pixels were recorded at particular brightness levels. The left side of the chart represents shadow areas; the right side represents highlight areas, and the center represents mid-tones.
Reading a histogram properly helps photographers determine the appropriate exposure for the scene, and whether they are at risk of severe under- or overexposure.However, if your histogram shows portions of the graph that appear to get cut off on the right, that means portions of your scene are severely overexposing to the point that detail may be lost. This is a warning that your exposure should be adjusted. Try applying minus Exposure Compensation, until you see that no part of your histogram is cut off at the right edge.
Another way to check for overexposure during playback is with a feature called Highlight Alert. When active, this alert shows all portions of the frame on the verge of overexposing with a blinking indicator. This is an optional feature that can be enabled or disabled,although Digital Rebels use it as a default during histogram playback.
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