New Blue Filter for the Colormaster Differential Colorimeter Based on Judd’s Modified Standard Observer

L. S. White; A. E. Jacobsen

doi:10.1364/JOSA.55.000177

Journal of the Optical Society of America
Vol. 55,
Issue 2,
pp. 177-184
(1965)
•https://doi.org/10.1364/JOSA.55.000177

New Blue Filter for the Colormaster Differential Colorimeter Based on Judd’s Modified Standard Observer

L. S. White and A. E. Jacobsen

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L. S. White and A. E. Jacobsen, "New Blue Filter for the Colormaster Differential Colorimeter Based on Judd’s Modified Standard Observer," J. Opt. Soc. Am. 55, 177-184 (1965)

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Abstract

Color measurement of anatase and rutile pigmentations using various color-mixture functions has shown that Judd’s 1949 modification of the standard observer provides the closest agreement with visual perception. The effect of Judd’s modification is to change the $\bar{z}$ function and the short-wavelength lobe of the $\bar{x}$ function, so that for a tristimulus filter colorimeter it is necessary to change only the blue filter. Such a blue filter has been designed for use with the Colormaster differential colorimeter. With this new filter, accurate color grading (in agreement with visual perception) can be made for titanium dioxide.

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	Percent reflectance
λ(mμ)	Rutile	Anatase
390	25.0	77.8
400	46.8	86.7
410	72.6	90.5
420	86.9	91.5
430	91.1	92.0
440	92.2	92.2
450	92.4	92.3
460	92.5	92.5
470	92.7	92.7
480	93.0	92.9
490	93.2	93.2
500	93.3	93.3
510	93.6	93.5
520	93.7	93.6
530	93.9	93.8
540	94.0	94.0
550	94.0	94.0
560	94.0	94.1
570	94.1	94.2
580	94.2	94.3
590	94.3	94.3
600	94.3	94.3
610	94.3	94.2
620	94.3	94.2
630	94.2	94.1
640	94.3	94.1
650	94.3	94.0
660	94.4	94.0
670	94.5	94.1
680	94.5	94.1
690	94.7	94.3
700	94.8	94.3

	Illuminant C		Rutile		Anatase
System	x	y	x	y	x	y
1931 CIE, Ref. 3.	0.3100	0.3164	0.3121	0.3196	0.3116	0.3185
Judd (1949), Ref. 4.	0.3150	0.3262	0.3190	0.3334	0.3169	0.3289
Judd (1951), Ref. 12.	0.3128	0.3215	0.3159	0.3268	0.3146	0.3238
Stiles 2°, Ref. 9.^a	0.3136	0.3173	0.3156	0.3216	0.3149	0.3197
Stiles 10°, Ref. 9.^a	0.3136	0.3166	0.3155	0.3204	0.3150	0.3188
Speranskaya, Ref. 10.^a	0.3162	0.3189	0.3183	0.3234	0.3176	0.3212
Stiles–Burch–Speranskaya, Ref. 13.	0.3104	0.3191	0.3127	0.3226	0.3120	0.3212

			Panels
			A	B	C	D	E	R
	Pigmentation	Percent anatase	100	95	90	80	40	0
	Pigmentation	Percent rutile	0	5	10	20	60	100
1931 CIE	Excitation purity (%)		0.97	0.91	0.95	1.13	1.27	1.45
	Rank		3	1	2	4	5	6
Stiles–Burch–Speranskaya	Excitation purity (%)		1.01	0.94	1.00	1.24	1.31	1.57
	Rank		3	1	2	4	5	6
Judd (1949)	Excitation purity (%)		1.28	1.48	1.71	2.15	2.58	3.14
	Rank		1	2	3	4	5	6

	Panels						Correlation Coefficients
Observer	A	B	C	D	E	R	1931 CIE and Stiles–Burch–Speranskaya	Judd (1949)
Observer	Visual Ranking						1931 CIE and Stiles–Burch–Speranskaya	Judd (1949)
LSW	1	2	3	4	5	6	0.83	1.00
	1	2	3	4	5	6	0.83	1.00
FM	1	2	3	4	5	6	0.83	1.00
	2	1	3	4	5	6	0.94	0.94
RC	3	1	2	4	5	6	1.00	0.89
	2	1	3	4	5	6	0.94	0.94
AJS	3	1	2	4	5	6	1.00	0.83
	1	2	3	4	5	6	0.83	1.00
PJM	1	2	3	4	5	6	0.83	1.00
	1	2	3	4	5	6	0.83	1.00
DFA	1	2	3	4	5	6	0.83	1.00
	1	2	3	4	5	6	0.83	1.00
RH	1	2	3	4	5	6	0.83	1.00
	1	2	3	4	5	6	0.83	1.00
AJM	1	2	3	4	5	6	0.83	1.00
	1	2	3	4	5	6	0.83	1.00
PBM	1	2	3	4	5	6	0.83	1.00
	3	1	2	4	5	6	0.94	0.94
AK	1	3	2	4	6	5	0.71	0.89
	3	1	2	4	5	6	1.00	0.83
ERS	1	2	3	4	5	6	0.83	1.00
	1	2	3	4	5	6	0.83	1.00
MDK	1	2	3	4	5	6	0.83	1.00
	1	2	3	4	5	6	0.83	1.00
TJN	2	1	3	4	6	5	0.89	0.89
	1	2	3	4	5	6	0.83	1.00

	Over-all average correlation coefficient						0.860	0.967

	Percent reflectance
λ(mμ)	Rutile	Anatase
390	25.0	77.8
400	46.8	86.7
410	72.6	90.5
420	86.9	91.5
430	91.1	92.0
440	92.2	92.2
450	92.4	92.3
460	92.5	92.5
470	92.7	92.7
480	93.0	92.9
490	93.2	93.2
500	93.3	93.3
510	93.6	93.5
520	93.7	93.6
530	93.9	93.8
540	94.0	94.0
550	94.0	94.0
560	94.0	94.1
570	94.1	94.2
580	94.2	94.3
590	94.3	94.3
600	94.3	94.3
610	94.3	94.2
620	94.3	94.2
630	94.2	94.1
640	94.3	94.1
650	94.3	94.0
660	94.4	94.0
670	94.5	94.1
680	94.5	94.1
690	94.7	94.3
700	94.8	94.3

Abstract

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Tables (3)

Equations (4)

Journal of the Optical Society of America