tristimulus


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tristimulus

Systems that generate color with three color components. See trichromaticity.
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Current innovativa products include a complete line of spectrophotometers, tristimulus colorimeters, quality control and color formulation software.
The method proposed for standardization specifies measurement of the tristimulus values at three angles: near specular, far from specular and one more angle in between.
Tristimulus Data Color Measurement and Control, with chapters on Instrumentation, Measurement in the Graphic Arts Workflow, Color Specification, Color Management, Color Formulation, Color Control, and Color Verification; and a glossary.
The instrument, capable of storing spectral and tristimulus sample and standard readings, features utility software for conversion of ASCII files.
Extent of discoloration was conducted using WSD-111 colorimeter, and yellow index (Yl) was obtained from the tristimulus values X, Y, and Z using the equation given in the following:
Karon Millar of Campden BRI, who edits the document, explains: "As well as consolidating all previous updates to the third edition of this document, the fourth edition of the Manual of methods for wheat and flour testing (Campden BRI Guideline 3) features the new Tristimulus method for flour colour determination, which is being adopted by all UK flour millers from the beginning of 2010.
Where L*, a* and b* represent, lightness, red-green, and yellow-blue coordinate respectively; X, Y, Z are the CIE XYZ tristimulus values of the sample; [X.
1 shows the so called tristimulus XYZ curves of the human colour perception.
A number of standard test methods and specification under the responsibility of this Subcommittee were reviewed and will be revised to include reference to ASTM E 29 "Standard Practice for Using Significant Digits in Determining Conformance to Specifications," reference ASTM D 5386, "Standard Test Method for Color of Liquids by Tristimulus Colorimetry", whenever appropriate and reword the reference to D 1078 distillation to address a directive from ASTM to remove references to mercury in glass thermometer and E 1 "Specification for ASTM Thermometers.
In colorimetry, these three primary colors are referred to as x (red), y (green) and z (blue) coordinates, or tristimulus values.
Additional discussion of CIELAB values from XYZ tristimulus values determination can be found in reference 19.
The color measurements were done after the kiln-drying with a tristimulus colorimeter, Minolta CR 310, with a measuring head 50 mm in diameter.