ArgyllCMS spectra viewer and converter

a*b* diagram

Spectra processed: 10, wavelength range: 420–740 nm.
CSV file | report: https://pozhvanov.ru/spectro?view_id=0000-fltr-grnd&legend=on

#	sRGB	R	G	B	H	S	B(V)	L	X	Y	Z	L*	a*	b*	λmin	λmax	Integral
Formatt—Tint—0.6	#868783	134 115	135 116	131 112	75 75	3 3	53 45	52 45	23	24	18.9	56.1	-0.8	2	420	740	1032.75 K
Formatt—Transparent	#f4f3f1	244 240	243 239	241 237	40 40	1 1	96 94	95 94	86.2	89.3	72.6	95.7	0.1	1	420	707	2788.2 K
Lee—Tint—.6	#888c8a	136 119	140 121	138 120	150 150	3 2	55 47	54 47	24.5	25.9	21.1	58	-2.1	0.6	647	740	1072.25 K
Lee—Transparent	#f8f7f6	248 245	247 245	246 244	30 60	1 0	97 96	97 96	89.8	93.1	76.1	97.3	0	0.6	420	703	2892.32 K
Singh-Ray—Tint—0.6	#798185	121 106	129 109	133 114	200 218	9 7	52 45	50 43	20.2	21.5	19.3	53.4	-2.3	-3.5	597	733	1121.69 K
Singh-Ray—Transparent	#f7f6f6	247 245	246 244	246 244	0 0	0 0	97 96	97 96	89.4	92.6	76	97.1	0.1	0.3	427	673	2880.23 K
Cokin—Tint—0.6	#818687	129 113	134 115	135 116	190 200	4 3	53 45	52 45	22.3	23.6	19.8	55.6	-2	-0.9	597	730	1176.22 K
Cokin—Transparent	#f7f7f6	247 244	247 244	246 243	60 60	0 0	97 96	97 95	89.2	92.6	75.9	97.1	-0.1	0.4	420	703	2876.16 K
Formatt—Firecrest—Transparent	#f1f2f1	241 238	242 238	241 237	120 60	0 0	95 93	95 93	85	88.4	72.5	95.3	-0.3	0.4	430	483	2656.15 K
Formatt—Firecrest—Tint	#918f8c	145 125	143 124	140 121	36 45	3 3	57 49	56 48	26.5	27.4	21.7	59.4	0.4	1.8	430	723	826.92 K

Use ArgyllCMS to acquire spectra:

#   reflectance spectrum
spotread -v -s -H "file_refl.sp"
#   transmission spectrum
spotread -v -s -H -t "file_trans.sp"
#   emission spectrum
spotread -v -s -H -e "file_emiss.sp"
#   flash emission spectrum
spotread -v -s -H -f "file_flash.sp"
#   ambient light spectrum
spotread -v -s -H -a "file_ambnt.sp"
Do not know how to start?
Try viewing ambient light spectrum or compare cloudy sky with flashlight, macro flash and two different lamps.
Found bugs, have suggestions, etc.? You know where to complain.
Application manual is coming later this year.