Konica Minolta CS-200 Principle of Measurement, The, x= X , y= Y, X+Y+Z X+Y+Z, X,Y, and Z are tristimulus values

Principle of Measurement

Spectral Fitting Method

Konica Minolta’s newly-developed spectral fitting method provides tristimulus values (XYZ = red, green, blue) with significantly higher accuracy than that of conventional tris- timulus colorimeters. This is achieved by using the output from 40 sensors to calculate the spectral response corresponding to human eye sensitivity (CIE 1931 color-matching functions).

•The CS-200 uses 40 sensors for sensitivity covering the entire visible region and multiplies each sensor output by appropriate coefficients. This adjusts the spectral response of the instrument to close to the CIE 1931 color-matching functions.

•In additon to the 2˚ Standard Observer, the 10˚ Standard Observer (for object-color measurements) can also be selected, which is impossible with conventional tristimu- lus colorimeters.

Object is measured with this spectral response and gained tristimulus values (X,Y, and Z) are converted into Lvxy, Lvu'v', LvT∆uv, and dominant wavelength through calculation to be displayed as measurement value.

CIE 1931 color-matching functions

sensitivity	1.0
				Spectral sensitivity of
				conventional tristimulus
Relative				colorimeters
	0.5
	380 400	500	600	700	780

Wavelength (nm)

CIE 1931 color-matching functions

sensitivity	1.0
				Spectral sensitivity
Relative				of the CS-200
	0.5
	380 400	500	600	700	780

Wavelength (nm)

CIE 1931 color-matching functions and spectral response of a conventional tristimulus colorimeter

CIE 1931 color-matching functions and spectral response of the CS-200

Chromaticity coordinates (x,y) in Lvxy (CIE 1931 color space) can be obtained through following formula.

x= X , y= YX+Y+Z X+Y+ZX,Y, and Z are tristimulus values.

Description

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