Tristimulus colorimeter (original) (raw)
A tristimulus colorimeter, colloquially shortened to colorimeter, 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. The illuminant and observer conditions should be specified when citing a measurement (e.g. D65/10°). * *
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| dbo:abstract | A tristimulus colorimeter, colloquially shortened to colorimeter, 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. * Color sensor of a colorimeter * The CIE 1931 XYZ color matching functions (en) Un colorimetro tristimolo è uno strumento usato nei processi di elaborazione digitale delle immagini per profilare e calibrare dispositivi di output grafici come gli schermi di computer. Applicato alla superficie dello schermo, il colorimetro è in grado i registrare precisamente i colori riprodotti dallo schermo stesso, grazie a una griglia di fotorivelatori dotati di filtri. La calibrazione viene eseguita da un'applicazione software che produce una gamma di colori sullo schermo e registra le corrispondenti letture del colorimetro, usandole per generare un profilo ICC per lo schermo stesso. Il profilo prodotto viene quindi installato nel sistema operativo del computer o comunque reso disponibile alle applicazioni dotate di color management. I dettagli del processo di calibrazione possono variare. (it) |
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| rdfs:comment | A tristimulus colorimeter, colloquially shortened to colorimeter, 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. The illuminant and observer conditions should be specified when citing a measurement (e.g. D65/10°). * * (en) Un colorimetro tristimolo è uno strumento usato nei processi di elaborazione digitale delle immagini per profilare e calibrare dispositivi di output grafici come gli schermi di computer. Applicato alla superficie dello schermo, il colorimetro è in grado i registrare precisamente i colori riprodotti dallo schermo stesso, grazie a una griglia di fotorivelatori dotati di filtri. La calibrazione viene eseguita da un'applicazione software che produce una gamma di colori sullo schermo e registra le corrispondenti letture del colorimetro, usandole per generare un profilo ICC per lo schermo stesso. Il profilo prodotto viene quindi installato nel sistema operativo del computer o comunque reso disponibile alle applicazioni dotate di color management. I dettagli del processo di calibrazione possono v (it) |
| rdfs:label | Colorimetro tristimolo (it) Tristimulus colorimeter (en) |
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