Empirical BRDF parameters for RGB reflective inks
| Wavelength $\lambda$ (nm) |
380 |
390 |
400 |
410 |
420 |
430 |
440 |
450 |
460 |
470 |
480 |
490 |
500 |
510 |
520 |
530 |
540 |
550 |
560 |
570 |
580 |
590 |
600 |
610 |
620 |
630 |
640 |
650 |
660 |
670 |
680 |
690 |
700 |
710 |
720 |
730 |
740 |
750 |
760 |
770 |
780 |
| Red $\rho(\lambda)$ |
2.034682 |
2.221275 |
2.210924 |
2.011437 |
1.724878 |
1.380290 |
1.064595 |
0.779506 |
0.547262 |
0.375234 |
0.273221 |
0.227772 |
0.226749 |
0.259436 |
0.320589 |
0.398189 |
0.500294 |
0.616680 |
0.747865 |
0.869380 |
0.989164 |
1.098081 |
1.200557 |
1.291179 |
1.358762 |
1.384294 |
1.422069 |
1.447050 |
1.522021 |
1.622972 |
1.651697 |
1.687806 |
1.689929 |
1.701761 |
1.679745 |
1.676441 |
1.653002 |
1.663771 |
1.644042 |
1.665895 |
1.636877 |
| Red $c(\lambda)$ |
1.449779 |
1.200581 |
0.998285 |
0.877097 |
0.803993 |
0.871900 |
1.024177 |
1.345430 |
1.868913 |
2.529912 |
3.160972 |
3.629795 |
3.776163 |
3.724923 |
3.527148 |
3.298558 |
3.020107 |
2.772039 |
2.542147 |
2.332355 |
2.134254 |
1.984137 |
1.827677 |
1.693893 |
1.607675 |
1.602421 |
1.521271 |
1.474772 |
1.403528 |
1.306359 |
1.274445 |
1.235296 |
1.266920 |
1.274450 |
1.304030 |
1.307904 |
1.328643 |
1.314894 |
1.384945 |
1.345730 |
1.441345 |
| Green $\rho(\lambda)$ |
1.464959 |
1.726499 |
1.539211 |
1.021011 |
0.530190 |
0.296464 |
0.319530 |
0.482516 |
0.727727 |
1.025922 |
1.314649 |
1.569669 |
1.713426 |
1.804771 |
1.881341 |
1.889439 |
1.881718 |
1.858499 |
1.843487 |
1.789836 |
1.730828 |
1.667495 |
1.631567 |
1.578583 |
1.521252 |
1.427378 |
1.355272 |
1.263849 |
1.139440 |
0.983878 |
0.831518 |
0.704808 |
0.570680 |
0.463587 |
0.357300 |
0.290787 |
0.240142 |
0.224227 |
0.206242 |
0.222266 |
0.233992 |
| Green $c(\lambda)$ |
1.589523 |
1.077860 |
0.931380 |
1.382928 |
2.527970 |
3.855390 |
4.031911 |
3.543641 |
2.985238 |
2.445008 |
1.998618 |
1.658803 |
1.415360 |
1.275751 |
1.156355 |
1.090111 |
1.041177 |
1.026629 |
0.993055 |
0.955922 |
0.920134 |
0.916253 |
0.837618 |
0.790514 |
0.775797 |
0.849859 |
0.852827 |
0.907417 |
0.979800 |
1.006774 |
1.151235 |
1.372359 |
1.756422 |
2.124418 |
2.638898 |
3.023209 |
3.414350 |
3.546119 |
3.802290 |
3.660568 |
3.684099 |
| Blue $\rho(\lambda)$ |
0.880237 |
1.355841 |
1.717606 |
1.881279 |
1.946755 |
1.906929 |
1.830213 |
1.727491 |
1.624293 |
1.506403 |
1.372999 |
1.233401 |
1.088490 |
0.927630 |
0.759039 |
0.587050 |
0.430048 |
0.294997 |
0.195554 |
0.126021 |
0.093479 |
0.085391 |
0.093959 |
0.108463 |
0.135430 |
0.165490 |
0.203349 |
0.241682 |
0.262258 |
0.270644 |
0.276727 |
0.296368 |
0.311442 |
0.331161 |
0.330555 |
0.349011 |
0.372603 |
0.392133 |
0.414453 |
0.451507 |
0.467151 |
| Blue $c(\lambda)$ |
2.481649 |
1.898311 |
1.518295 |
1.313483 |
1.125464 |
1.029023 |
0.937860 |
0.892576 |
0.875111 |
0.856795 |
0.840413 |
0.857263 |
0.901215 |
1.008029 |
1.151529 |
1.447859 |
1.876782 |
2.532411 |
3.324951 |
4.158699 |
4.735045 |
4.963861 |
4.821236 |
4.618558 |
4.258484 |
3.963211 |
3.614651 |
3.366070 |
3.274635 |
3.262556 |
3.292478 |
3.225676 |
3.252518 |
3.208441 |
3.275114 |
3.225976 |
3.159057 |
3.110201 |
3.115028 |
2.968928 |
3.030270 |
| Illuminant A |
9.7951 |
12.0853 |
14.708 |
17.6753 |
20.995 |
24.6709 |
28.7027 |
33.0859 |
37.8121 |
42.8693 |
48.2423 |
53.9132 |
59.8611 |
66.0635 |
72.4959 |
79.1326 |
85.947 |
92.912 |
100 |
107.184 |
114.436 |
121.731 |
129.043 |
136.346 |
143.618 |
150.836 |
157.979 |
165.028 |
171.963 |
178.769 |
185.429 |
191.931 |
198.261 |
204.409 |
210.365 |
216.12 |
221.667 |
227 |
232.115 |
237.008 |
241.675 |
| Illuminant D65 |
49.9755 |
54.6482 |
82.7549 |
91.486 |
93.4318 |
86.6823 |
104.865 |
117.008 |
117.812 |
114.861 |
115.923 |
108.811 |
109.354 |
107.802 |
104.79 |
107.689 |
104.405 |
104.046 |
100 |
96.3342 |
95.788 |
88.6856 |
90.0062 |
89.5991 |
87.6987 |
83.2886 |
83.6992 |
80.0268 |
80.2146 |
82.2778 |
78.2842 |
69.7213 |
71.6091 |
74.349 |
61.604 |
69.8856 |
75.087 |
63.5927 |
46.4182 |
66.8054 |
63.3828 |