key tone

Definition: (1) The black in an image. (2) The principal or most important tone in an image. * For an average image, it usually the equivalent to about 18% reflectance grey, hence with high-key the key tone is high i.e. brighter than normal, so the image is overall bright. With low-key the key-tone is low i.e. darker than usual, bringing down overall image brightness.

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