XYZ Tristimulus

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The CIE XYZ 1931 Tristimulus system is a modified version of the RGB colour tristimulus system and uses non real or imaginary stimuli. This innovation allows all colours within its gamut to be expressed as positive numbers, unlike the RGB system, where some colours fall outside its gamut and are expressed as negatives. The XYZ chromaticity co-ordinates are defined as x,y,and z.

Tristimulus values are percentages of the components in a three-colour additive mixture necessary to match a colour; in the CIE system, they are designated as X, Y and Z. The illuminant and standard observer colour-matching functions used must be designated; if they are not, the assumption is made that the values are for the 1931 observer (2º field) and illuminant C.

The values obtained depend on the method of integration used, the relationship of the nature of the sample and the instrument design used to measure the reflectance or transmittance. Tristimulus values are not, therefore, absolute values characteristic of a sample, but relative values dependent on the method used to obtain them.

Approximations of CIE tristimulus values may be obtained from measurements made on a tristimulus colorimeter that gives measurements generally normalised to 100.

These must then be normalised to equivalent CIE values. The filter measurements should be properly designated as R, G and B instead of X, Y and Z.

Applications

  • Chemicals
  • Coatings
  • Edible Oils and Fats
  • Food and Beverage
  • Household Products
  • Petroleum Oils and Waxes
  • Plastics
  • Sugar Solutions, Syrups and Honey
  • Textiles
Title Application Part Number Add to quotation cart
NC45 Coatings | Food and Beverage | Household Products | Medical and Clinical Products | Plastics | Sugar Solutions, Syrups and Honey | Textiles | Waste Water Treatment 400810
OnColor Lite Chemicals | Coatings | Household Products | Plastics | Textiles 400590
OnColor Premium Chemicals | Coatings | Household Products | Plastics | Textiles 400610
PFXi-195/1 Chemicals | Coatings | Household Products | Petroleum Oils and Waxes 1371951
PFXi-195/2 Petroleum Oils and Waxes 1371952
PFXi-195/3 Edible Oils and Fats | Food and Beverage 1371953
PFXi-195/4 Beer, Malts and Caramels | Food and Beverage 1371954
PFXi-195/5 Household Products | Medical and Clinical Products | Pharmaceuticals and Cosmetics 1371955
PFXi-195/6 Chemicals | Household Products 1371956
PFXi-195/7 Sugar Solutions, Syrups and Honey 1371957
PFXi-195/8 Waste Water Treatment 1371958
PFXi-195/9 Beer, Malts and Caramels | Chemicals | Coatings | Edible Oils and Fats | Food and Beverage | Household Products | Medical and Clinical Products | Petroleum Oils and Waxes | Pharmaceuticals and Cosmetics | Plastics | Sugar Solutions, Syrups and Honey 1371959
PFXi-880/L Edible Oils and Fats 1378801
PFXi-880/P Petroleum Oils and Waxes 1378803
RT250 Elite Package RT 250 Coatings | Food and Beverage | Household Products | Medical and Clinical Products | Plastics 402505
RT300 (0/45) 7 mm aperture Coatings | Food and Beverage | Household Products | Medical and Clinical Products | Plastics 400300
RT305 (0/45) 4 mm aperture Coatings | Food and Beverage | Household Products | Medical and Clinical Products | Plastics 400305
RT310 (0/45) 15 mm aperture Coatings | Food and Beverage | Household Products | Medical and Clinical Products | Plastics 400310
RT320 (0/45) 4, 7 & 15 mm aperture Coatings | Food and Beverage | Household Products | Medical and Clinical Products | Plastics 400320
RT400 (diffuse/8) 8 mm aperture Chemicals | Coatings | Food and Beverage | Household Products | Medical and Clinical Products | Pharmaceuticals and Cosmetics | Plastics | Textiles 400400
RT500 (diffuse/8) 8 mm aperture Chemicals | Coatings | Food and Beverage | Household Products | Medical and Clinical Products | Pharmaceuticals and Cosmetics | Plastics | Textiles 400500
RT500 Explorer Package RT500 & OnColor Lite Chemicals | Coatings | Food and Beverage | Household Products | Medical and Clinical Products | Pharmaceuticals and Cosmetics | Plastics | Textiles 400505
RT505 (diffuse/8) 4 mm aperture Chemicals | Coatings | Food and Beverage | Household Products | Medical and Clinical Products | Pharmaceuticals and Cosmetics | Plastics | Textiles 400504
RT520 (diffuse/8) 4 & 8 mm aperture Chemicals | Coatings | Food and Beverage | Household Products | Medical and Clinical Products | Pharmaceuticals and Cosmetics | Plastics | Textiles 400520
RT530 (diffuse/8) 14 mm Aperture Chemicals | Coatings | Food and Beverage | Household Products | Medical and Clinical Products | Pharmaceuticals and Cosmetics | Plastics | Textiles 400530
RT650 (diffuse/8) Compact Spectrophotometer Chemicals | Coatings | Food and Beverage | Household Products | Medical and Clinical Products | Pharmaceuticals and Cosmetics | Plastics | Textiles 407000
RT650 Expert Package RT650 & OnColor Premium Chemicals | Coatings | Food and Beverage | Household Products | Plastics | Textiles
Applicable Standard ASTM E308