Why HE doesn't have flat histogram

Why do histogram equalisation programs usually not produce images with flat histograms?

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Image Analyst
Image Analyst 2016-2-19
All it does is to redistribute the gray levels non-linearly. It's not flat because the image quantized into gray levels. If it were continuous, it would be flat. However, there are ways to get a flat histogram. See my attached demos.

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2016-2-19

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