The higher the peaks, the more of that color is in your image. Your vertical (y axis) shows the concentration of that value in your image. Your horizontal (x axis) represents your value range, from your darkest blacks on your left side, to your lightest whites on your right. You can think of a histogram as a sort of simple algebraic mapping of the information in your image. Out of the box, Paint.NET does not have a stand alone Histogram tool, but has them built into other tools that we will discuss later. The left is the histogram tool in Photoshop (Window > Histogram), the right is the Histogram tool in the GIMP (Colors > Info >Histogram). Histograms are confusing looking collections of information, and are not obviously understood unless they are explained.
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