The Power of Histograms

One of the features offered by many cameras these days is the ability to display histograms. These can be viewed for a recorded image, or in many cases for a live scene, allowing you to judge the exposure of a picture. So what exactly are histograms?

A histogram shows a graphic representation of the balance of tones across a range from black to white, through the various shades of grey. It shows the relative number of pixels across the range, usually for the full spectrum of light, but often for just red, green or blue – the colours that make up a projected image.

Using a histogram you can judge the exposure of an image – whether it is too bright, too dark, or just right.

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