Photo Plus - - A-Z Guide -

A graph that pro­vides an in­stant guide to the con­trast and ex­po­sure of a pic­ture. It maps the dis­tri­bu­tion of tones, from the dark­est on the left to the bright­est on the right. The scale runs from 0 (solid black) to 255 (pure white), and the height of the graph at any point rep­re­sents the rel­a­tive num­ber of pix­els in the im­age with that bright­ness level. The over­all shape of the his­togram gives you an at-a-glance in­di­ca­tion of the tonal range of the im­age and the pres­ence of any clip­ping. You can use tools such as Lev­els in Pho­to­shop to ad­just the shape of the his­togram and thereby im­prove the con­trast and ex­po­sure of the im­age.

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