Contrast

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Contrast


1. In general, the degree of differentiation between different tones in an image.
Where the degree is slight, the image is said to be flat. Where the difference is marked, it is said to be contrasty.
2. The difference in luminance between two portions of the visual field usually expressed as:

c = (background - test field)/background * 100%


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Since this ratio can be negative for nearly black targets at close range, and since the sign of the contrast has no psycho-physical significance, it is conventional to use only its absolute value. See threshold contrast.

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use