Wikipedia
A latent image is an invisible image produced by the exposure to light of a photosensitive material such as photographic film. When photographic film is developed, the area that was exposed darkens and forms a visible image. In the early days of photography, the nature of the invisible change in the silver halide crystals of the film's emulsion coating was unknown, so the image was said to be "latent" until the film was treated with photographic developer.
In more physical terms, a latent image is a small cluster of metallic silver atoms formed in or on a silver halide crystal due to reduction of interstitial silver ions by photoelectrons (a photolytic silver cluster). If intense exposure continues, such photolytic silver clusters grow to visible sizes. This is called printing out the image. On the other hand, the formation of a visible image by the action of photographic developer is called developing out the image.
The size of a silver cluster in the latent image can be as small as a few silver atoms. However, in order to act as an effective latent image center, at least four silver atoms are necessary. On the other hand, a developed silver grain can have billions of silver atoms. Therefore, photographic developer acting on the latent image is a chemical amplifier with a gain factor up to several billion. The development system was the most important technology that increased the photographic sensitivity in the history of photography.
"Latent Image" is the 105th episode of the American science fiction television series Star Trek: Voyager airing on the UPN network, the 11th episode of the fifth season. Robert Picardo said that this is not only his favorite Voyager episode, but also the most important in the development of the Doctor's character.
A latent image on photographic film is an invisible image produced by the exposure of the film to light.
Latent image may also refer to:
- Latent image (printing), a security printing method
- "Latent Image" (Star Trek: Voyager), an episode of the TV series Star Trek: Voyager
Usage examples of "latent image".
And hadn't he, once, told her that you could see danger sometimes, focus on it like a latent image, and it would run like a red web back and forth between whatever it was that was going to cause you harm?
Patterns of lines rippling past him, and he had it, the latent image impressed through the retina on to the brain suddenly giving meaning.