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grain

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n. ~ 1. A pattern or structure in materials caused by the alignment of component fibers or particles. - 2. A design embossed on a surface to imitate a natural pattern. - 3. Photography ยท The relative coarseness of an image that results from the size of silver particles in the emulsion.

Notes: 

Grain3 is usually invisible to the naked eye. It becomes more visible as a negative is enlarged; prints made from small negatives are generally grainer than prints of the same size from a larger negative. Grain is generally more pronounced in high-speed emulsions.