Fine silver crystals in the light-sensitive emulsion of film that react when exposed to light and turn black. The slower the film speed the finer the grain and the faster the film speed the more present the grain. Larger film formats can be enlarged without much grain is noticed whereas 35mm formats may see noticeable grain beyond an 8 x 10 inch print.guidtofilmphotography
Minute crystals of silver halides in the light-sensitive emulsion of film that react when exposed to light, turning black, are called grains. (See Graininess of film.)
Appearance of the noise in a homogeneous part of an image.
Processed silver halides that clump together to form an image. The finer the grain the more detailed the image will be.
Silver particles that remain on the film after processing to form an image. Usually, the faster the film, the coarser the grain, the less the Definition.
Digital algorithms used to reduce the amount of undesirable grain in a sequence of images.