Coefficients used in a branch of mathematics called diferential geometry. In colour science they represent the coefficients of an ellipse or an ellipsoid that defines the boundary of an equal colour difference based on either perceptability or acceptability data. The ellipse equation is as follows:
where x and y are chromaticity coordinates and
is a colour difference composed of differences of just chromaticity.Gamma correction
Gamut
The total area or volume of colour space that can be obtained with the available colorants.
Gamut mapping
Converting the coordinates of one gamut into those of another. This often involes Gamut compression.
Gaussian curvature (of colour space)
Geodesic line
Gloss trap
A device used in a spectrophotometer to eliminate the specular component of a measurement.
Goniochromatic specimens
Goniophotometer
Goniophotometric curve
Grassmann's laws
1) The eye can distinguish only three kinds of difference or variation (eg. Hue, brightness and saturation).
2) If, of a three stimulus mixture, one stimulus is steadily changed while the others remain constant, the colour of the mixture steadily changes.
3) Stimuli of the same colour (hue, brightness and saturation) produce identical effects in mixtures regardless of their spectral composition.