Abstract

A compact, portable, visual, telescopic colorimeter has been designed for use in studies of photographic color reproduction. Telescopic viewing permits measurement of the color and luminance of areas as small as 38in. square. Alternative Maxwellian viewing is provided for measuring nonuniform samples or samples having a rough or grainy texture. The precision and accuracy of this instrument have been found to be highly satisfactory.

© 1958 Optical Society of America

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References

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  1. D. L. MacAdam, J. Opt. Soc. Am. 32, 271 (1942).

1942 (1)

D. L. MacAdam, J. Opt. Soc. Am. 32, 271 (1942).

MacAdam, D. L.

D. L. MacAdam, J. Opt. Soc. Am. 32, 271 (1942).

J. Opt. Soc. Am. (1)

D. L. MacAdam, J. Opt. Soc. Am. 32, 271 (1942).

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Figures (10)

Fig. 1
Fig. 1

Photograph of colorimeter and accessory equipment.

Fig. 2
Fig. 2

Schematic of colorimeter optical system.

Fig. 3
Fig. 3

Color filter array.

Fig. 4
Fig. 4

Schematic of matching field.

Fig. 5
Fig. 5

Grid for direct plotting of CIE coordinates from calorimeter scale readings (schematic).

Fig. 6
Fig. 6

Table of relative logY vs calorimeter scale coordinates.

Fig. 7
Fig. 7

Discrimination ellipses for RB.

Fig. 8
Fig. 8

Discrimination ellipses for JC.

Fig. 9
Fig. 9

MacAdam’s discrimination ellipses.

Fig. 10
Fig. 10

Chromaticity grid for single dyes and two-dye combinations of a reflection print material.

Equations (6)

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X R = λ E x ¯ T R d λ , Y R = λ E y ¯ Y R d λ , Z R = λ E z ¯ T R d λ ,
X = A R X R + A G X G + A B X B , Y = A R Y R + A G Y G + A B Y B , Z = A R Z R + A G Z G + A B Z B ,
x = X / ( X + Y + Z ) , y = Y / ( X + Y + Z ) .
K R = A R / A R , K G = A G / A G , K B = A B / A B ,
X = K R A R X R + K G A G X G + K B A B X B , Y = K R A R Y R + K G A G Y G + K B A B Y B , Z = K R A R Z R + K G A G Z G + K B A B Z B .
X = A R ( K R X R ) + A G ( K G X G ) + A B ( K B X B ) , Y = A R ( K R Y R ) + A G ( K G Y G ) + A B ( K B Y B ) , Z = A R ( K R Z R ) + A G ( K G Z G ) + A B ( K B Z B ) .