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Digital Photography Glossary

Photography Glossary - G

Understand the terminology of digital photography, digital printing and digital imaging so that you will become a better photographer. Photographic terms such as Gamma, Gif, Grain, Grayscale, and more.

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Gamma

Gamma is a technical term that measures the midtone brightness of a digital image. Gamma is an adjustable value that allows you to alter the brightness of the middle range of gray tones without radically changing the image's shadows and highlights.

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GIF

GIF stands for Graphics Interchange Format. It is a file format for storing graphical images that contain up to 256 colors. It uses LZW compression which is a lossless compression method. GIF is used on the web primarily for logos.

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Grain

ISO Sensitivity Comparison

Grain is the actual physical emulsion particles on a piece of film that reacts when exposed to light. Grain refers to the size of the emulsion particles.

Click here to learn more: Learn How ISO Sensitivity Works

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Graininess

Graininess is a descriptive term used to characterize the level of film grain (emulsion particles on the film frame) visibly apparent to the human eye.

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Gray Card

Gray Card (18%) is a reference tonal value of gray that represents "middle gray" on the grayscale. The Gray Card is used a standard in photography to establish consistent exposure and color value representation. It has only 18% reflectivity.

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Grayscale

Grayscale is the tonal scale of grays that can be captured by photography, ranging from pure white to the pure black.

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