Photography processing

Photographic processing, a series of processes by which the image created when a photographic film is exposed to light, either latent or invisible, is transformed into a permanent visible image.

Production of the Latent Film Picture

Over a film or other substance, an emulsion holding grains of photosensitive chemical compounds called silver halides is dispersed. Light from an object being photographed coming through the camera lens hits some parts of the film, leaving the grains of silver halide unstable in certain regions.

 This produces an impression of the object on the film that is unseen, or latent. The regions that produce the most light in the latent picture have the greatest number of fragile grains. They become the darkest areas of the visible image upon development. Conversely, the bright parts of the visible image are formed by areas that receive little light.

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The Negative is processed

The visual picture is also called a negative, owing to the transfer of dark and light areas from the latent image to the visible image. Bathing it in a chemical developer that reduces the unstable silver halide grains to black metallic silver, which shapes the film, is the most common way of rendering the image visible. In addition to the reduction agent, which is typically an organic compound such as phenol or amine, the standard developer includes additives that allow the production to proceed at the desired rate, prevent the air from removing the reduction agent, and prevent the film from fogging unexposed silver halides. Generally speaking, each developer is designed to be used with various film emulsions and to achieve the desired results, such as grain fineness in the finished shot. There are some phrases for photo post processing.

Print manufacture

A positive image also called a print, or a snapshot, in which the light and dark areas of the object and the image correlate, may be created using the negative. By first projecting the negative onto a photosensitive paper, the positive is generated. The positive generated is equal to the negative if it is achieved through direct touch, i.e. when you bring the negative and the photosensitive paper together. The positive image can be expanded or diminished when a system of lenses is interposed. Then a process like the negative process produces the latent picture on the photo-sensitive document.

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