A bar graph that uses the width of the bars to represent the various classes and the height of the bars to represent their relative frequencies.Camera HistogramsDigital camera histograms show the image's overall exposure. Using 256 vertical bars to represent brightness levels from 0 to 255, the leftmost bar is the darkest pixel level (0), and the rightmost bar is the lightest (255). The height of the bars represents the total number of pixels at that brightness level.What is of most interest to the photographer is how the bars spread horizontally from left to right. For example, if there are no bars on the left, there are no black pixels in the image.
A bar graph of a frequency distribution in which the horizontal axis lists each unique value (or range of values) in a set of data, and the height of each bar represents the frequency (or relative frequency) of that value (or range of values).
To represent (data) as a histogram.
Origin of histogram
- Greek histos mast, web stā- in Indo-European roots –gram
From American Heritage Dictionary of the English Language, 5th Edition
- From Ancient Greek ἱστός (histos, “mast”) + -γραμμα (-gramma).