Push processing is a special type of processing where the film is developed for a longer time than normal, usually to make up for intended underexposure. It should be noted that only entire rolls can be pushed, not individual scenes. Pushing film will add some contrast and graininess.thepolliofolioglossaryofcinematographyterms
Increasing development time of a film to force an increase in its effective speed, generally done to normalize results when the film has been underexposed. Also known as Forced development.
Using an extended development time to compensate for underexposure, either intentional for effect or accidental.
Increasing the development time of a film to increase its effectivespeed (raising the ISO number for initial exposure ) for low-light situations; forceddevelopment.
ncreasing the development time of a film to increase its effective speed (raising the ISO number for initial exposure) for low-light situations; forced development.