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Chapter 15 An Overview of Image Adjustments 297
However, a series of peaks in the brighter side of the histogram often indicates an overexposed
image because most of the pixels in the image are too bright.
Evaluating Tonality and Contrast
Although histogram graphs are good tools for evaluating an image’s exposure, you shouldn’t
interpret histograms for exposure information only, because the shape of the histogram is also
inuenced by the tonality in the scene. You need to take the subject of the image into account
when evaluating its histogram. For example, images shot at night are naturally going to have a
majority of peaks in the darker side of the histogram.
Likewise, images of bright scenes, such as snow or light reecting o the ocean, have a majority
of their peaks in the brighter side of the histogram.