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 ?
Aquinas's discussions on the nature of evil and sin frequently evoked what Schillebeeckx came to call experiences of negative contrast.
The lower axes present the percentage change in the number of draws from the second container in the negative contrast condition from the median number of draws from the second container in the baseline conditions for each subject.
That is, currently deprived subjects should show transient negative contrast that recurs on subsequent shifts and positive contrast during initial shifts, obscured on later shifts by a ceiling effect.
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 clonidine on negative contrast and novelty-induced stress.
Administration of corticosterone after the first downshift trial enhances consummatory successive negative contrast.
It can also aid in the diagnosis of atypical presentations, (8) and it is helpful in cases in which clinical suspicion of perforation remains despite negative contrast studies.
However, if the original task is easy and the second task is difficult, there should be negative contrast between the originally easy task and the second, harder task and the negative contrast would be expected to result in a decrease in persistence.
In a study of 168 adult patients undergoing CT imaging for abdominal discomfort, drinking milk achieved bowel distension and enhancement comparable to that seen after using the negative contrast agent VoLumen (E-Z-EM), Dr.
Negative contrast agents make the lumen of the intestine appear dark, while the IV contrast makes the intestinal wall appear bright.
The paper defines and discusses the character of five such myths, explaining the negative contrast with the social sciences that accompanies each one.
In stark negative contrast, dogmatic Fire Brigade Union leaders still appear hell-bent on causing maximum economic disruption and inconvenience to the public by frequent wildcat strikes pursuing unachievable goals.