Push/pull processing
Push processing is a technique used in film photography to increase the film's speed. This is accomplished by taking photographs with exposures that are shorter than what is typically advised and by increasing the amount of time spent developing the film proportionally. Photographers are able to work in lower light situations as a result, but the grain size of their images is increased. Pull processing refers to the technique of utilizing longer exposures than are advised and minimizing the amount of time spent developing the negative in order to produce a negative with less contrast and grain.
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