contrast

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Related to negative contrast: positive contrast

contrast

1. (in painting) the effect of the juxtaposition of different colours, tones, etc.
2. 
a. (of a photographic emulsion) the degree of density measured against exposure used
b. the extent to which adjacent areas of an optical image, esp on a television screen or in a photographic negative or print, differ in brightness
3. Psychol the phenomenon that when two different but related stimuli are presented close together in space and/or time they are perceived as being more different than they really are

Contrast

A juxtaposition of dissimilar elements to show the differences of form or color, or to set in opposition in order to emphasize the differences.

Contrast

 

in psychology, the subjective exaggeration of the differences between perceived objects or between certain sectors of the visual field during their spatial (simultaneous contrast) or temporal (successive contrast) contiguity. Thus, when the color black is placed next to white it seems even blacker. Contrast may also be manifested in color change. For example, a gray square on a red background seems greenish blue; on a blue background it looks orange. The sharpest contrast of two colors is expressed at the boundary of the two areas (boundary contrast). The phenomenon of assimilation is the opposite of contrast. Contrast is widely used in various forms of art and literature.

REFERENCES

Vudvorts, R. Eksperimental’naia psikhologiia. Moscow, 1950.
Teplov, B. M. “Vzaimodeistvie odnovremennykh svetovykh oschchushchenii.” In Zritel’nye oshchushcheniia i vospriiatiia. Moscow-Leningrad, 1935.

contrast

[′kän‚trast]
(communications)
The degree of difference in tone between the lightest and darkest areas in a television or facsimile picture.
(computer science)
In optical character recognition, the difference in color, reflectance, or shading between two areas of a surface, for example,a character and its background.

contrast

The white level of a display screen. The contrast adjusts how bright the white is. See brightness and contrast ratio.
References in periodicals archive ?
No studies have been conducted with humans regarding preceding- and following-schedule effects, few have directly compared positive and negative contrast, and only one has investigated within-component contrast.
Effect of serotonergic drugs on negative contrast in consummatory behavior.
Effect of anxiolytics and antidepressants on extinction and negative contrast. Pharmacology & Therapeutics, 46, 309-320.
Although it is less common to use negative contrast agents such as milk or VoLumen, they may be particularly useful in patients with inflammatory bowel disease or infiltrating cancers where it is important to enhance the view of the bowel wall, Dr.
Price is another advantage of using milk as a negative contrast agent.
In the NUV, the phenomenon of negative contrast discussed above lends itself to the construction of an NUV tracker for use against silhouetted targets.
Negative contrast agents have low signal intensity on T1- and T2-weighted imaging, and include superparamagnetic particles.
- A set of treatments using negative contrast agent - Task No.
Although no macroscopic or microscopic lesions were observed at necropsy, negative contrast electron microscopy showed typical rhabdovirus-like, bullet-shaped particles in Vero cell cultures that showed a focal cytopathic effect (5).
They can also create high contrast optimization in MRI as positive contrast in comparison with iron oxide nanoparticles (negative contrast agent).
Consummatory succesive negative contrast in young and middle-aged rats.
Choice responses during consummatory successive negative contrast in rats