What is a Histogram?

Computer programs and cameras are able to draw histograms of an image. What is a histogram and how you can read it.

This video shows what it is by hand drawing a histogram. Basically it is a bar graph. We have values from 0 (complete black) to 255 (complete white). The height of each small bar represents the number of pixels of the same gray level. If the histogram is moved to the left side, it means there are more dark tones in the image. If it is moved to the right side, there are more light tones.