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 Mark as favourite
Our non-contact spectrophotometer enables colour measurement of powders, gels, liquids, creams and pastes from a distance, in their natural state
  • Coatings | Food and Beverage | Household Products | Medical and Clinical Products | Plastics | Sugar Solutions, Syrups and Honey | Textiles | Waste Water Treatment
400810
Entry-level colour quality control package which works with many of the Lovibond® spectrophotometers
  • Chemicals | Coatings | Household Products | Plastics | Textiles
400590
comprehensive colour quality control package avilable for all Lovibond® spectrophotometers from handheld to benchtop units
  • Chemicals | Coatings | Household Products | Plastics | Textiles
400610
Lovibond® PFXi-195/1 - The industry standard spectrophotometric colorimeter giving accurate results and benefitting from remote calibration
  • Chemicals | Coatings | Household Products | Petroleum Oils and Waxes
1371951
Lovibond® PFXi-195/2 - The industry standard spectrophotometric colorimeter giving accurate results and benefitting from remote calibration
  • Petroleum Oils and Waxes
1371952
Lovibond® PFXi-195/3 - The industry standard spectrophotometric colorimeter giving accurate results and benefitting from remote calibration
  • Edible Oils and Fats | Food and Beverage
1371953
Lovibond® PFXi-195/4 - The industry standard spectrophotometric colorimeter giving accurate results and benefitting from remote calibration
  • Beer, Malts and Caramels | Food and Beverage
1371954
Lovibond® PFXi-195/5 - The industry standard spectrophotometric colorimeter giving accurate results and benefitting from remote calibration
  • Household Products | Medical and Clinical Products | Pharmaceuticals and Cosmetics
1371955
Lovibond® PFXi-195/6 - The industry standard spectrophotometric colorimeter giving accurate results and benefitting from remote calibration
  • Chemicals | Household Products
1371956
Lovibond® PFXi-195/7 - The industry standard spectrophotometric colorimeter giving accurate results and benefitting from remote calibration
  • Sugar Solutions, Syrups and Honey
1371957
Lovibond® PFXi-195/8 - The industry standard spectrophotometric colorimeter giving accurate results and benefitting from remote calibration
  • Waste Water Treatment
1371958
Lovibond® PFXi-195/9 - The industry standard spectrophotometric colorimeter giving accurate results and benefitting from remote calibration
  • 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
Lovibond® PFXi-880/L - Accurate & highly efficient spectrophotometric colorimeter with optional integrated heater & remote calibration
  • Edible Oils and Fats
1378801
Lovibond® PFXi-880/P - Accurate & highly efficient spectrophotometric colorimeter with optional integrated heater & remote calibration
  • Petroleum Oils and Waxes
1378803
RT 250 Spectrophotometer is ideal for the measurement of materials such as paper, plastic, fabric and a variety of hard surfaces
  • Coatings | Food and Beverage | Household Products | Medical and Clinical Products | Plastics
402505
This portable hand-held spectrophotometer allows you to obtain absolute and differential measurements in the lab, plant or field
  • Coatings | Food and Beverage | Household Products | Medical and Clinical Products | Plastics
400300
This portable handheld spectrophotometer is the most convenient way to measure colour, allowing you to obtain accurate measurements in the lab, plant or field
  • Coatings | Food and Beverage | Household Products | Medical and Clinical Products | Plastics
400305
This portable handheld spectrophotometer is the most convenient way to measure colour, allowing you to obtain accurate measurements in the lab, plant or field
  • Coatings | Food and Beverage | Household Products | Medical and Clinical Products | Plastics
400310
Highly flexible and portable spectrophotometer provides the perfect opportunity to measure colour anywhere in your facilities
  • Coatings | Food and Beverage | Household Products | Medical and Clinical Products | Plastics
400320
This cost effective, portable and flexible spectrophotometer featuring sphere technology is perfect for measuring colour on site or in the field
  • Chemicals | Coatings | Food and Beverage | Household Products | Medical and Clinical Products | Pharmaceuticals and Cosmetics | Plastics | Textiles
400400
Portable sphere spectrophotometer with extreme flexibility for multiple applications. An ideal mid-range solution for accurate colour measurement
  • Chemicals | Coatings | Food and Beverage | Household Products | Medical and Clinical Products | Pharmaceuticals and Cosmetics | Plastics | Textiles
400500
Portable sphere spectrophotometer with extreme flexibility for multiple applications. An ideal mid-range solution for accurate colour measurement
  • Chemicals | Coatings | Food and Beverage | Household Products | Medical and Clinical Products | Pharmaceuticals and Cosmetics | Plastics | Textiles
400505
Portable sphere spectrophotometer with extreme flexibility for multiple applications
  • Chemicals | Coatings | Food and Beverage | Household Products | Medical and Clinical Products | Pharmaceuticals and Cosmetics | Plastics | Textiles
400504
Flexible sphere spectrophotometer with switchable 4mm & 8mm aperture. Lightweight and portable, perfect for your colour measurement needs
  • Chemicals | Coatings | Food and Beverage | Household Products | Medical and Clinical Products | Pharmaceuticals and Cosmetics | Plastics | Textiles
400520
Sphere spectrophotometer for larger areas with 14mm aperture. Lightweight and portable, perfect for your colour measurement needs
  • Chemicals | Coatings | Food and Beverage | Household Products | Medical and Clinical Products | Pharmaceuticals and Cosmetics | Plastics | Textiles
400530
Reliable and accurate compact benchtop spectrophotometer ideal for small to medium-sized manufacturers looking to establish accurate colour measurement
  • Chemicals | Coatings | Food and Beverage | Household Products | Medical and Clinical Products | Pharmaceuticals and Cosmetics | Plastics | Textiles
407000
Reliable and accurate compact benchtop spectrophotometer ideal for small to medium-sized manufacturers looking to establish accurate colour measurement
  • Chemicals | Coatings | Food and Beverage | Household Products | Plastics | Textiles
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Applicable Standard ASTM E308