An invisible image produced by the exposure of a photosensitive material to light.
For other uses, see Latent image (disambiguation).
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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.
A latentimage is an invisible image produced by the exposure to light of a photosensitive material such as photographic film. When photographic film is...
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stored in a digital image file for subsequent display or processing. The result with photographic emulsion is an invisible latentimage, which is later chemically...
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perfect latentimage. Where there is text or image on the document, the corresponding area of the drum will remain unlit. Where there is no image the drum...
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introduced in 1839), in which only an extremely faint or completely invisible latentimage had to be produced in the camera, which could be done in a minute or...
which affect the sensitivity to light and allow for the formation of a latentimage. Frenkel defects and quadropolar deformation The major defect in silver...
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steps are: Exposure of the image onto the sensitized paper using a contact printer or enlarger; Processing of the latentimage using the following chemical...