Graininess in a photograph results from the emulsion characteristics of film, noise level in digital photography or processing techniques. Although most photographers and manufacturers strive to eliminate grain, for certain images increasing grain creates interesting artistic effects. Because many older emulsions were quite grainy, photographers use grain to emulate classic black and white technique. Although you can increase grain in both color and black and white images, graininess in digital color images involves chromatic as well as textural effects and is harder to do successfully.
Instructions
- 1
Choose a high-speed film. Films with an ISO number of 400 or over have visible grain in 8x10 prints. (reference 1) Use a neutral-density filter if your high-speed film is over-exposed at the smallest aperture setting of your lens. Push processing that processes a lower-speed film longer, as if it were a high-speed film, will increase grain in enlarged prints. Filtration during processing and development time can also affect grain for film. Slightly under-exposed film will be grainier than correctly exposed film.
2Use a high ISO setting to increase noise, which is the digital equivalent of grain.
3Enlarge your image to make grain more visible. No matter how low your ISO, whether film or digital, sufficient magnification will always reveal grain or noise structure.
4Use editing software to increase graininess. Most high-end photographic editing programs include options to increase grain.
5Reduce the number of pixels in a digital image using compression algorithms. The smaller the file size a given image is reduced to, the fewer dots per inch, and thus the greater the graininess.
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