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Chapter 17. Correcting Brightness and Co... > About an Image's Histogram

136. About an Image's Histogram


Business analysts and economists frequently create charts whose sole purpose is to confirm for their benefactors what they already know about their business or about the world in which they live. What they can't say out loud with spoken language about how expensive things are getting, how unproductive workers have become, and how few employees there seem to be on this continent can be conveyed briefly and simply in a chart that speaks volumes. One word for a type of chart that speaks volumes about a changing subject—any subject—is a histogram. Adobe uses the concept of the histogram in all its imaging tools, including Photoshop Elements, to refer to a chart that describes the progression of tones and of brightness in images. What is difficult to describe in words about what's right or what's wrong about an image, a histogram conveys in mere moments.


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