Glossary of pre-press, graphic arts & color reproduction, G

Gamut

The range of colors available to a specific output device, such as a laserprinter or an imagesetter. If the color range is too wide for that particular device, it is referred to as 'out of gamut'.

For example, the RGB color range is much broader than the CMYK color gamut (which is what most pre-press output devices use). Colors specified using the RGB gamut will often fall out of the gamut range when output on a CMYK device.

Gray Component Replacement (GCR)

Commonly known as GCR, this process involves replacing the gray tone in the cyan, magenta and yellow plates, with black ink, during the color separation process. Not to be confused with Undercolor Removal.

See also: Undercolor Removal

Gray balance

Using cyan, magenta, yellow and black to produce a neutral grey image.

See also: CMYK

Grams per Square Metre (GSM)

GSM is the term used for the method of measuring paper and board weight.