Unique hue correction applied to the color rendering of LED light sources

Pedro J. Pardo; Eduardo Cordero; María Isabel Suero; Ángel L. Pérez

doi:10.1364/JOSAA.33.00A248

Journal of the Optical Society of America A
Vol. 33,
Issue 3,
pp. A248-A254
(2016)
•https://doi.org/10.1364/JOSAA.33.00A248

Unique hue correction applied to the color rendering of LED light sources

Pedro J. Pardo, Eduardo Cordero, María Isabel Suero, and Ángel L. Pérez

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Pedro J. Pardo, Eduardo Cordero, María Isabel Suero, and Ángel L. Pérez, "Unique hue correction applied to the color rendering of LED light sources," J. Opt. Soc. Am. A 33, A248-A254 (2016)

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Abstract

Existing color quality indices for light sources provide broad information about different dimensions related to color quality. Color fidelity, harmony, and gamut area are concepts related to these indices, and industry requests this information. For the last few years, LED light sources have been widely used at home and at work, and now a color rendering index that solves the problem of underestimation of this type of light source is needed to provide a score of subjective assessments made by real observers related to color fidelity. In this work, this problem has been studied in two ways, theoretically and experimentally, and the results show discrepancies between the hue composition calculated theoretically using a color appearance model and hue composition evaluated by real observers. These discrepancies could originate from divergences in the color fidelity score and the subjective evaluation of the naturalness of a scene.

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Light Sources	CCT (K)	CIE $R_{a}$	CIE $R_{a 96}$	IES $R_{f}$	Subjective Assessment
Filtered halogen	3369	98.9	98.5	99.4	$8.3 \pm 0.8$
D50 simulator	4959	96.3	95.9	92.2	$7.4 \pm 0.9$
White LED	5673	64.3	83.5	62.7	$6.5 \pm 0.7$
LED RGBA	4406	73.9	87.8	77.6	$5.8 \pm 0.7$

Constant Chromaticness	1	2	3	4	5	6
Red–Yellow	S 1060-R	S 1060-Y80R	S 1060-Y60R	S 1060-Y40R	S 1060-Y20R	S 1060-Y
Yellow–Green	S 1060-Y	S 1060-G80Y	S 1060-G60Y	S 1060-G40Y	S 1060-G20Y	S 1060-G
Green–Blue	S 1050-G	S 1050-B80G	S 1050-B60G	S 1050-B40G	S 1050-B20G	S 1050-B
Blue–Red	S 2050-B	S 2050-R80B	S 2050-R60B	S 2050-R40B	S 2050-R20B	S 2050-R
Constant Hue	1	2	3	4	5	6
Red	S 1010-R	S 1020-R	S 1030-R	S 1040-R	S 1050-R	S 1060-R
Blue	S 1010-B	S 1020-B	S 1030-B	S 1040-B	S 1050-B	S 1060-B
Green	S 1010-G	S 1020-G	S 1030-G	S 1040-G	S 1050-G	S 1060-G
Yellow	S 1010-Y	S 1020-Y	S 1030-Y	S 1040-Y	S 1050-Y	S 1060-Y

		Sample Number by Quadrants
Light Source	Quadrant	#1	#2	#3	#4	#5	#6
Filtered Halogen	R-Y	5	23	45	62	82	99
	Y-G	102	120	145	162	180	198
	G-B	205	221	240	260	280	297
	B-R	302	319	339	359	380	396
LED RGBA	R-Y	3	21	45	59	81	99
	Y-G	102	119	139	158	178	197
	G-B	203	218	239	260	279	297
	B-R	301	318	338	358	376	395
D50 Simulator	R-Y	3	21	45	59	81	99
	Y-G	102	120	141	159	181	197
	G-B	204	220	241	262	282	298
	B-R	301	319	340	360	378	395
White LED	R-Y	5	23	42	61	82	100
	Y-G	100	119	139	159	181	198
	G-B	206	224	246	265	282	299
	B-R	303	319	338	356	378	395

		Sample Number by Quadrants
Light Source	Quadrant	#1	#2	#3	#4	#5	#6
Filtered Halogen	R-Y	1	15	29	44	66	92
	Y-G	92	111	129	145	171	200
	G-B	216	228	243	254	266	285
	B-R	287	306	329	365	387	402
LED RGBA	R-Y	−2	9	23	38	68	101
	Y-G	101	122	140	154	171	195
	G-B	207	218	233	246	261	286
	B-R	289	310	331	362	384	398
D50 Simulator	R-Y	−1	12	25	40	62	88
	Y-G	88	106	124	142	169	197
	G-B	213	224	239	250	261	280
	B-R	282	304	324	359	384	400
White LED	R-Y	−3	18	39	61	87	113
	Y-G	113	125	137	148	162	187
	G-B	197	210	231	251	273	301
	B-R	302	315	330	351	376	399

Unique Hue NCS Samples		1060-R	1060-Y	1060-G	1050-B
Light source	Hue comp	0	100	200	300
Filtered Halogen	Calculated	1	92	200	285
	Observed	5	100^a	198	297
	$Δ H$	−4	−8	2	−12
LED RGBA	Calculated	−2	101	195	286
	Observed	3	100^a	197	297
	$Δ H$	−5	1	−2	−11
D50 simulator	Calculated	−1	88	197	280
	Observed	3	100^a	197	298
	$Δ H$	−4	−12	0	−18
White LED	Calculated	−3	113	187	301
	Observed	5	100	198	299
	$Δ H$	−6	13	−11	2

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Journal of the Optical Society of America A