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Histograms have nothing to do with pictures of female reproductive sterilization.
A histogram is a graph that shows the digital imager the balance and placement of the pixels in an image. Below is a portion of the histogram window in Photoshop of a properly exposed image. There are 256 bars numbered from zero on the left to 255 on the right. The bars at the left represent the darkest pixels and the bars at the right represent the lightest pixels. The taller a bar the more pixels there are in the image at that level.