A histogram is a graphical diagram showing the distribution of some type of data. Histograms usually appear
as bar or line graphs.
This histogram from Abobe photoshop shows the tonality of a particular image. The black area represents the distribution of the total number of image pixels over the tonal range of the image. If the majority of pixels were to the left the image would be dark, if they were all at right the image would be light.
View more about Photoshop's Histograms
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