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Gamma
- A measure of the amount of contrast found in an
image according to the properties of a gradation curve.
High contrast has high gamma and low contrast low
gamma.
Gamma
Correction - In 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 bleached
out, or too dark.
Gamut
- The range of colours that are available in an image
or output process. It is generally used in describing
the capabilities of a printer to reproduce colours
faithfully and vibrantly.
GIF
- A graphic file format used mainly for Web graphic
or small animated files. Not good for photos as it
only contains a maximum of 256 colours.
Gigabyte
(GB) - A measure of computer memory or disk
space consisting of about one thousand million bytes
(a thousand megabytes). The actual value is 1,073,741,824
bytes (1024 megabytes).
Gradation
- A smooth transition between black and white, one
colour and another, colour and no colour.
Gray
Level - The brightness of a pixel. The value
associated with a pixel representing it's lightness
from black to white. Usually defined as a value from
0 to 255, with 0 being black and 255 being white.
Gray
Scale - A term used to describe an image containing
shades of gray rather than colour. Most commonly referred
to as a black and white photo.
Guide
Number - The output power rating of a electronic
flash unit.
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