The Histogram is the most important fingerprint of an image. It can warn you if an image is underexposed or overexposed. Modern cameras can display the histogram before you take the picture, so you can find the optimal exposure for the photo. The following examples show how to interpret histograms.
The left side of the curve represents the shadows, while the highlights are on the right side. If the histogram has a high peak on the left, a lot of pixels in the picture are dark, or in shadow. A peak on the right of the curve means that a lot of pixels are bright, or in the highlights. Peaks in the middle of the graph represent pixels in the midtones of your exposure. Ideally, curves blend into the horizontal axis before reaching the right and left edges.
CodedColor has a number of tools to correct exposure. See the following topics for more infomation:
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