Gamma. Measure of the amount of contrast in an image according to the properties of a gradation curve. High contrast = High Gamma and Low = Low.
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Gamma Correction. With reference to displaying an image accurately on a computer screen, Gamma correction controls the overall brightness of an image. Images which are not properly corrected can look either too dark or bleached out.
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Gamut. This is the range of colors that are available in an image or output process. Gamut is generally used in describing the capabilities of a printer to reproduce colors accurately and vibrantly.
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GIF. A graphic file format mainly used for Web graphic or small animated (GIF) files. Not good for photographs as it only contains a maximum of 256 colors.
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Gradation. A smooth transition between black and white, one color and another or color and no color.
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Grey Level. This is the brightness level of a pixel representing it's lightness from black to white. It is usually defined as a value from 0 to 255, with 0 being black and 255 being white.
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Grey Scale. A term used to describe an image containing shades of grey rather than color. Most commonly referred to as a black and white photograph.
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Guide Number. The power output rating of a speedlight flash unit.
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