Methods are suggested for reducing the labour involved in colorimetric transformations, with particular application to routine industrial measurements. The calibration of an instrument by measurement of illuminant B is replaced by measurement of a suitable stable filter and the illuminant in usual use. A nomographic method of conversion from instrument readings to the C.I.E. basis is suggested, and a graphical method is given for conversion to terms of hue and saturation. Scales are given for a graphical method of converting from the spectrophotometric curve of a coloured specimen to the trichromatic coefficients with a series of illuminants on the C.I.E. basis. The errors of these methods are estimated for comparison with the errors of observation on a Hilger-Guild trichromatic colorimeter.
[1]
Herbert E. Ives,et al.
The transformation of color mixture equations from one system to another. II. Graphical aids
,
1923
.
[2]
W. D. Wright,et al.
Hue-discrimination in normal colour-vision
,
1934
.
[3]
T. Smith,et al.
The C.I.E. colorimetric standards and their use
,
1931
.
[4]
The transformation of trichromatic mixture data: algebraic methods
,
1924
.
[5]
H. Ives.
The transformation of color-mixture equations from one system to another
,
1915
.
[6]
D. B. Judd.
The 1931 I. C. I. Standard Observer and Coordinate System for Colorimetrya,b
,
1933
.