Histogram
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A representation of a frequency distribution by means of rectangles whose widths represent class intervals and whose areas are proportional to the corresponding frequencies. A graph defining the contrast and dynamic range of an image.
This histogram from Nikon Capture NX shows the RGB and CMYK values in their respective colours, and the greyscale values as white.
For more information, see the Nikonians guide Understanding Your Digital Camera's Histogram by Digital Darrell [1]
