positive

(redirected from positives)
Also found in: Dictionary, Thesaurus, Medical, Legal, Idioms.

positive:

see photographic processingphotographic processing,
set of procedures by which the latent, or invisible, image produced when a photographic film is exposed to light is made into a permanent visible image.
..... Click the link for more information.
.

Positive

 

a photographic image in which the relative distribution of brightness, in black-and-white photography, or colors, in color photography, corresponds to the distribution in the object photographed. Thus, a positive is opposed to a negative, in which there is an inverse distribution of brightness or a registration of the image in complementary colors. Two types of positives are distinguished—those produced on photographic materials with an opaque support, such as paper or ceramic material, and those produced on photographic materials with a transparent support, such as glass or film; the second type comprises diapositives and motion-picture film positives intended to be viewed against a light source or to be projected onto a screen.

Positives are obtained by contact or projection printing onto positive photographic materials—the positive process. With this process, a large number of positives can be made from a single negative; with projection printing, positives can be made any size. Positives produced as a single copy, such as amateur motion-picture films and slides, are made on reversal materials by reversal process. In color cinematography, in addition to the negative-positive and reversal processes, the imbibition process is used, which produces positives from three color-separation black-and-white negatives.

positive

[′päz·əd·iv]
(electricity)
Having fewer electrons than normal, and hence having ability to attract electrons.
(graphic arts)
Having the same rendition of light and shade as in the original scene.
(mathematics)
Having value greater than zero.
References in periodicals archive ?
However, there is an important difference in terms of how we proceed in the face of positives.
Each particle has its positives and negatives that can be balanced to reach specific papermaking goals.
McGuire, a former assistant commissioner of public health in Massachusetts and one of Walensky's research collaborators, the sheer number of rapid tests being conducted means that a small but significant number of false positives are turning up.
The real problem is in deciding how precautionary to be in the face of inevitable uncertainties, demanding that we understand the equally inevitable false positives and false negatives from screening evidence.
Beyond the first sentence, we couldn't avoid a few more minor negatives that are also really positives, such as "not what we must believe," "unguided evolutionary change," and "without resorting to violence.
False positives can occur with viral load tests, but a review of the data in the August, 1999 American Family Physician (1) suggests it is usually possible to differentiate these from the real thing: "During the symptomatic phase of acute HIV infection, the viral RNA shows in excess of 50,000 copies per mL.
New Jersey initially accepted all dead bird specimens but later reduced the testing of specimens from several counties where numerous positives had been identified.
As each day passed with no other positives found, investigators worried that they might be forced to build a circumstantial criminal case, relying totally on the one positive test result in Washington.
While false positives are increasing among some ESPs, the industry as a whole is winning the fight to reduce the amount of spam," says Dave Dabbah, Director of Sales and Marketing, Lyris Technologies.
In principle, we don't expect a high increase in the number of positives,'' said professor Jordi Segura, an official with the IOC doping commission.