Sunday, 31 July 2011

Photo Glossary - 11 - Histogram

In photography a histogram is a graphical indication of the brightness content of a photograph. In Excel terms it is a column graph with brightness on the X-axis (running from black on the left to white on the right) and number of pixels on the Y-axis. The curve shows the number of pixels of each brightness in the image so a dark image will be clustered towards the left and a bright image will be clustered towards the right.

Many cameras can display a photo’s histogram, either with the review function or live while shooting. It can be a very useful tool to check your exposure, especially when shooting in difficult lighting conditions, such as a combination of bright and dark in the same frame.

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