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- Gelatin Filter
- A color filter made of gelatin. Since gelatin can be dyed with a wide range of materials, filters can be made with a variety of colors for various effects.
- Ghost Image or Ghosting
- A double image that results from using flash in relatively bright light at a low shutter speed. The two images, one from the ambient light and a second from the flash, do not perfectly coincide.
- GIF
- Graphics image format. This is a raster-oriented graphic file format that allows the exchange of image files across multiple platforms.
- Gigabyte
- A unit of information equal to one billion bytes (1,024 megabytes).
- GPS
- Global Positioning System, in which the receiver calculates its position on the earth by timing signals received from GPS satellites.
- Graininess
- A term particular to film, it refers to the appearance of grain (the structure of a film's coating or emulsion) in a print, transparency or negative.
- Grayscale
- A term used to describe an image that contains multiple shades of gray, as well as black and white. Often used in imaging programs as a synonym for black-and-white.
- Guide Number
- Indicates the power of a flash in relation to ISO film speed.