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What (who) is histogram$35365$ - definition
![Histogram and density function for a [[Gumbel distribution]]<ref>[https://www.waterlog.info/cumfreq.htm A calculator for probability distributions and density functions]</ref>](https://commons.wikimedia.org/wiki/Special:FilePath/Gumbel distribtion.png?width=200 "Histogram and density function for a [[Gumbel distribution]]<ref>[https://www.waterlog.info/cumfreq.htm A calculator for probability distributions and density functions]</ref>")
![Skewed right]]](https://commons.wikimedia.org/wiki/Special:FilePath/Skewed-right.png?width=200 "Skewed right]]")
![Skewed left]]](https://commons.wikimedia.org/wiki/Special:FilePath/Skewed-left.png?width=200 "Skewed left]]")
Wikipedia
An image histogram is a type of histogram that acts as a graphical representation of the tonal distribution in a digital image. It plots the number of pixels for each tonal value. By looking at the histogram for a specific image a viewer will be able to judge the entire tonal distribution at a glance.
Image histograms are present on many modern services. Photographers can use them as an aid to show the distribution of tones captured, and whether image detail has been lost to blown-out highlights or blacked-out shadows. This is less useful when using a raw image format, as the dynamic range of the displayed image may only be an approximation to that in the raw file.
The horizontal axis of the graph represents the tonal variations, while the vertical axis represents the total number of pixels in that particular tone.
The left side of the horizontal axis represents the dark areas, the middle represents mid-tone values and the right hand side represents light areas. The vertical axis represents the size of the area (total number of pixels) that is captured in each one of these zones.
Thus, the histogram for a very dark image will have most of its data points on the left side and center of the graph.
Conversely, the histogram for a very bright image with few dark areas and/or shadows will have most of its data points on the right side and center of the graph.
