Sunflower image

Histogram of Sunflower image

Image histograms are present on many modern digital cameras an can be used as an aid to show the photographer whether he or she has captured and adequate amount of tones or whether image detail has been lost to blown-out highlights or blacked-out shadows^[2].

The horizontal axis of the graph represents the tonal variations, while the vertical axis represents the amount of pixels in that particular tone^[1]. The left side of the horizontal axis represents the black and dark areas, the middle represents medium grey and the right hand side represents light and pure white areas. The vertical axis, on the other hand, represents the size of the area which is captured in each one of these zones.

Image Manipulation and Histograms

Image editors have provisions to create an image histogram of the image being edited. The histogram plots the number of pixels in the image (vertical axis) with a particular brightness value (horizontal axis). Algorithms in the digital editor allow the user to visually adjust the brightness value of each pixel and to dynamically display the results as adjustments are made.^[3] Improvements in picture brightness and contrast can thus be obtained.

See also

• Histogram
• Image editing
• Color histogram, a multidimensional histogram of the distribution of color in an image
• Histogram equalization

References

1. ↑ ^{a b}
2. ↑
3. ↑