![]() When the histogram runs off the right side, the image will have many white pixels-either because the image is overexposed or because it is a bright scene such as the beach or snow. When the histogram is higher on the left side, the image is mostly composed of dark pixels, causing it to appear dark-either because the image is underexposed or because it is a dark scene such as night shot or sunset. ![]() ![]() By examining the histogram you can gauge the over-all exposure of an image. The vertical axis shows the proportion of pixels at each level of brightness. The horizontal axis shows the brightness level (from 0 to 255), with darker pixels towards the left side and brighter pixels toward the right. A histogram is a graph depicting the distribution of brightness values in the image.
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