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Tristimulus colorimeter
Device to measure color values
Device to measure color values
A tristimulus colorimeter, colloquially shortened to colorimeter or colourimeter, is used in digital imaging to profile and calibrate output devices. It takes a limited number of wideband spectral energy readings along the visible spectrum by using filtered photodetectors; e.g. silicon photodiodes.
A colorimeter with the known value of absolute error allows measuring (x,y)-chromaticity coordinates in red, green, blue and white colors. Measured values are used for calculation of LCD profile coefficients.
Originally, three glass filters whose transmittance spectra mimicked the CIE color matching functions (shown below) were employed. A filter bank may be used to decompose the individual color matching functions if more accuracy is desired.
A camera or colorimeter is said to be colorimetric if it satisfies the by (1868–1945) (also called the "Maxwell–Ives criterion"), reducing observer metamerism color errors, if the product of the spectral responsivity of the photoreceptor and the spectral transmittance of the filters is a linear combination of the CMFs.
A colorimeter or a digital camera with a color filter array can, under certain conditions, be used as an alternative to a spectrophotometer.
The illuminant and observer conditions should be specified when citing a measurement (e.g. D65/10°).
The quality of a colorimeter may be assessed using the means in CIE publication 179:2007.
There are various calibration methods for tristimulus colorimeters.
File:Spyder4Elite color sensor.JPG|Color sensor of a colorimeter File:CIE 1931 XYZ Color Matching Functions.svg|The CIE 1931 XYZ color matching functions
References
References
- Schanda, János. (2007). "Colorimetry: Understanding the CIE System". [[Wiley Interscience]].
- Zharinov I.O., Zharinov O.O.. (2015). "Method of software-based compensation of technological variation in chromaticity coordinates of LCD panels". Scientific and Technical Journal of Information Technologies, Mechanics and Optics.
- Hunter, Richard Sewall. (September 1942). "Photoelectric tristimulus colorimetry with three filters". [[JOSA]].
- Eppeldauer, George. (Nov–Dec 1998). "Spectral Response Based Calibration Method of Tristimulus Colorimeters". Journal of Research of the National Institute of Standards and Technology.
- Luther, Robert T.D.. (1927). "Aus dem Gebiet der Farbreizmetrik". Zeitschrift für technische Physik.
- Ohta, Noboru. (2005). "Colorimetry". John Wiley & Sons, Ltd..
- Imai, Francisco H.. (1999). "Spectral estimation using trichromatic digital cameras". Proceedings of the International Symposium on Multispectral Imaging and Color Reproduction for Digital Archives.
- Solli, Martin. (16 December 2004). "Filter characterization in digital cameras".
- Sangwine, Stephen J.. (1998). "The Colour Image Processing Handbook". [[Springer Science+Business Media.
- CIE TC 2-16 "Characterization of the Performance of Tristimulus Colorimeters". (2007). "Methods for characterising tristimulus colorimeters for measuring the colour of light". CIE Central Bureau.
- Gardner, James L.. (May–June 2007). "Comparison of Calibration Methods for Tristimulus Colorimeters". Journal of Research of the National Institute of Standards and Technology.
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