Definition: Adjective: (1) ~ contrast: showing or causing a wide range of lumimance (lighting) or density (developer, printing paper). * Often used in the sense that the brightest and darkest are at or close to maximum values. (2) ~ value: brightness that is significantly greater than mid-tone. (3) ~ key: image or lighting in which most of the tones are high value or bright. (4) Noun: a surface which should be planar but is very slightly convex i.e. contacts a flat test plate only at one point.

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