This atlas presents colors not only as they appear visually, but as they are spectrally structured.
In addition to standard color specifications (HEX, Lab D50/2°, HLC), two spectral–physical parameters are provided:
- λ*ext describes the spectral dominance of a color, indicating whether its reflectance is biased toward shorter or longer wavelengths.
- ARBE λ*V2 denotes the energetic balance point between absorption and reflection within the visible spectrum (380–730 nm).
Both parameters are computed directly from measured reflectance spectra and are independent of illuminant, observer model, or color space.
The atlas thus reveals where colors are energetically stable and where, despite a similar visual appearance, spectral differences and metameric risks arise. Use the filters, sorting options, and scatter view to compare colors on a physically grounded basis.
Note: ARBE λ* is not a color space and not a replacement for Lab or ΔE, but an additional layer of physical color description.
#49262a
L: 20.06
a: 16.95
b: 4.41
λ*ext: 716 nm
λ*V2: 393.3 nm
#4f2229
L: 20.08
a: 21.79
b: 5.14
λ*ext: 715 nm
λ*V2: 394.4 nm
#541d29
L: 20.09
a: 26.66
b: 5.87
λ*ext: 714 nm
λ*V2: 395.7 nm
#5a1828
L: 20.11
a: 31.55
b: 6.52
λ*ext: 712 nm
λ*V2: 397.4 nm
#5f1027
L: 20.12
a: 36.45
b: 7.13
λ*ext: 711 nm
λ*V2: 398.6 nm
#650327
L: 20.13
a: 41.36
b: 7.66
λ*ext: 709 nm
λ*V2: 400.3 nm
#483736
L: 25.02
a: 7.66
b: 3.08
λ*ext: 712 nm
λ*V2: 397.3 nm
#4f3435
L: 25.04
a: 12.46
b: 3.9
λ*ext: 712 nm
λ*V2: 398.1 nm
#553135
L: 25.06
a: 17.28
b: 4.7
λ*ext: 711 nm
λ*V2: 399.1 nm
#5c2d34
L: 25.08
a: 22.12
b: 5.48
λ*ext: 710 nm
λ*V2: 400.1 nm
#622933
L: 25.1
a: 26.97
b: 6.21
λ*ext: 708 nm
λ*V2: 401.4 nm
#682432
L: 25.11
a: 31.84
b: 6.95
λ*ext: 707 nm
λ*V2: 402.7 nm
#6d1d31
L: 25.13
a: 36.69
b: 7.66
λ*ext: 705 nm
λ*V2: 404.7 nm
#731531
L: 25.14
a: 41.61
b: 8.22
λ*ext: 703 nm
λ*V2: 406.8 nm
#790730
L: 25.14
a: 46.61
b: 8.57
λ*ext: 699 nm
λ*V2: 410.3 nm
#544241
L: 30.02
a: 7.99
b: 3.38
λ*ext: 706 nm
λ*V2: 403.9 nm
#5c3f40
L: 30.04
a: 12.82
b: 4.17
λ*ext: 705 nm
λ*V2: 404.9 nm
#623c3f
L: 30.07
a: 17.63
b: 4.96
λ*ext: 703 nm
λ*V2: 406.3 nm
#69383e
L: 30.08
a: 22.45
b: 5.78
λ*ext: 702 nm
λ*V2: 407.4 nm
#6f343d
L: 30.1
a: 27.3
b: 6.52
λ*ext: 701 nm
λ*V2: 408.9 nm
#762f3c
L: 30.12
a: 32.14
b: 7.27
λ*ext: 699 nm
λ*V2: 410.6 nm
#7c2a3c
L: 30.13
a: 37.01
b: 7.97
λ*ext: 697 nm
λ*V2: 412.6 nm
#81233b
L: 30.15
a: 41.87
b: 8.69
λ*ext: 695 nm
λ*V2: 414.3 nm
#871a3a
L: 30.16
a: 46.78
b: 9.25
λ*ext: 692 nm
λ*V2: 417.9 nm
#8d0c3a
L: 30.15
a: 51.77
b: 9.68
λ*ext: 689 nm
λ*V2: 420.9 nm
#93003a
L: 30.17
a: 56.67
b: 10.2
λ*ext: 686 nm
λ*V2: 424.2 nm
#614d4c
L: 35.02
a: 8.35
b: 3.66
λ*ext: 698 nm
λ*V2: 411.8 nm
#694a4b
L: 35.04
a: 13.16
b: 4.44
λ*ext: 696 nm
λ*V2: 413.2 nm
#70474a
L: 35.07
a: 17.99
b: 5.22
λ*ext: 694 nm
λ*V2: 415.4 nm
#774349
L: 35.08
a: 22.8
b: 6.04
λ*ext: 694 nm
λ*V2: 416.1 nm
#7d3f48
L: 35.1
a: 27.63
b: 6.81
λ*ext: 692 nm
λ*V2: 418 nm
#843b47
L: 35.12
a: 32.48
b: 7.57
λ*ext: 690 nm
λ*V2: 420 nm
#8a3647
L: 35.13
a: 37.34
b: 8.28
λ*ext: 687 nm
λ*V2: 422.2 nm
#903046
L: 35.15
a: 42.2
b: 8.99
λ*ext: 685 nm
λ*V2: 424.5 nm
#962945
L: 35.16
a: 47.07
b: 9.68
λ*ext: 682 nm
λ*V2: 427.3 nm
#9c2044
L: 35.18
a: 51.97
b: 10.27
λ*ext: 679 nm
λ*V2: 430.7 nm
#a21244
L: 35.18
a: 56.93
b: 10.76
λ*ext: 676 nm
λ*V2: 434.2 nm
#a80044
L: 35.18
a: 61.88
b: 11.2
λ*ext: 672 nm
λ*V2: 437.8 nm
#6e5958
L: 40.02
a: 8.7
b: 3.93
λ*ext: 688 nm
λ*V2: 421.9 nm
#765657
L: 40.04
a: 13.52
b: 4.72
λ*ext: 686 nm
λ*V2: 423.2 nm
#7d5356
L: 40.06
a: 18.32
b: 5.54
λ*ext: 685 nm
λ*V2: 424.7 nm
#844f55
L: 40.09
a: 23.15
b: 6.3
λ*ext: 682 nm
λ*V2: 427.5 nm
#8b4b54
L: 40.1
a: 27.98
b: 7.07
λ*ext: 681 nm
λ*V2: 429 nm
#924753
L: 40.12
a: 32.82
b: 7.83
λ*ext: 679 nm
λ*V2: 430.5 nm
#984252
L: 40.13
a: 37.68
b: 8.57
λ*ext: 676 nm
λ*V2: 433.4 nm
#9f3d51
L: 40.15
a: 42.53
b: 9.32
λ*ext: 674 nm
λ*V2: 435.8 nm
#a53650
L: 40.17
a: 47.4
b: 9.98
λ*ext: 670 nm
λ*V2: 439.6 nm
#ab2f4f
L: 40.18
a: 52.27
b: 10.66
λ*ext: 667 nm
λ*V2: 442.5 nm
#b1254f
L: 40.2
a: 57.19
b: 11.22
λ*ext: 663 nm
λ*V2: 446.9 nm
#b7174e
L: 40.2
a: 62.12
b: 11.73
λ*ext: 659 nm
λ*V2: 451.1 nm
#bd004e
L: 40.2
a: 67.1
b: 12.14
λ*ext: 654 nm
λ*V2: 455.9 nm
#c3004d
L: 40.19
a: 72.01
b: 12.68
λ*ext: 650 nm
λ*V2: 460.2 nm
#7c6563
L: 45.02
a: 9.07
b: 4.17
λ*ext: 676 nm
λ*V2: 433.9 nm
#846262
L: 45.04
a: 13.87
b: 4.99
λ*ext: 675 nm
λ*V2: 435 nm
#8b5e61
L: 45.06
a: 18.69
b: 5.76
λ*ext: 672 nm
λ*V2: 437.8 nm
#925b60
L: 45.08
a: 23.52
b: 6.53
λ*ext: 670 nm
λ*V2: 440.1 nm
#99575f
L: 45.1
a: 28.34
b: 7.34
λ*ext: 668 nm
λ*V2: 441.5 nm
#a0535e
L: 45.12
a: 33.18
b: 8.08
λ*ext: 666 nm
λ*V2: 444 nm
#a74e5d
L: 45.14
a: 38.02
b: 8.84
λ*ext: 663 nm
λ*V2: 446.6 nm
#ae495c
L: 45.15
a: 42.87
b: 9.59
λ*ext: 661 nm
λ*V2: 449.2 nm
#b4435c
L: 45.17
a: 47.74
b: 10.25
λ*ext: 657 nm
λ*V2: 453 nm
#bb3d5b
L: 45.19
a: 52.6
b: 10.95
λ*ext: 653 nm
λ*V2: 456.7 nm
#c1355a
L: 45.2
a: 57.48
b: 11.65
λ*ext: 649 nm
λ*V2: 460.7 nm
#c72b59
L: 45.21
a: 62.37
b: 12.28
λ*ext: 645 nm
λ*V2: 465.1 nm
#cd1d59
L: 45.22
a: 67.29
b: 12.82
λ*ext: 641 nm
λ*V2: 469.2 nm
#d30158
L: 45.22
a: 72.28
b: 13.18
λ*ext: 635 nm
λ*V2: 474.8 nm
#d90058
L: 45.22
a: 77.22
b: 13.63
λ*ext: 629 nm
λ*V2: 481.6 nm
#89716f
L: 50.02
a: 9.43
b: 4.41
λ*ext: 662 nm
λ*V2: 447.9 nm
#916e6e
L: 50.05
a: 14.27
b: 5.13
λ*ext: 659 nm
λ*V2: 451 nm
#996a6d
L: 50.06
a: 19.05
b: 6.01
λ*ext: 658 nm
λ*V2: 451.7 nm
#a1676c
L: 50.08
a: 23.87
b: 6.81
λ*ext: 656 nm
λ*V2: 454.1 nm
#a8636b
L: 50.1
a: 28.72
b: 7.53
λ*ext: 653 nm
λ*V2: 456.9 nm
#af5f6a
L: 50.12
a: 33.54
b: 8.33
λ*ext: 651 nm
λ*V2: 459 nm
#b65b69
L: 50.13
a: 38.38
b: 9.09
λ*ext: 648 nm
λ*V2: 461.6 nm
#bd5668
L: 50.16
a: 43.22
b: 9.84
λ*ext: 645 nm
λ*V2: 465 nm
#c35067
L: 50.17
a: 48.09
b: 10.54
λ*ext: 641 nm
λ*V2: 468.7 nm
#ca4a66
L: 50.19
a: 52.95
b: 11.25
λ*ext: 638 nm
λ*V2: 472.4 nm
#d14366
L: 50.21
a: 57.82
b: 11.91
λ*ext: 632 nm
λ*V2: 477.5 nm
#d73b65
L: 50.22
a: 62.68
b: 12.63
λ*ext: 628 nm
λ*V2: 481.6 nm
#dd3164
L: 50.23
a: 67.57
b: 13.25
λ*ext: 624 nm
λ*V2: 486.3 nm
#e32363
L: 50.23
a: 72.49
b: 13.8
λ*ext: 617 nm
λ*V2: 492.7 nm
#ea0863
L: 50.24
a: 77.45
b: 14.24
λ*ext: 611 nm
λ*V2: 499.6 nm
#f00063
L: 50.23
a: 82.42
b: 14.64
λ*ext: 603 nm
λ*V2: 507 nm
#977d7b
L: 55.02
a: 9.78
b: 4.69
λ*ext: 647 nm
λ*V2: 462.5 nm
#a07a7a
L: 55.04
a: 14.6
b: 5.48
λ*ext: 645 nm
λ*V2: 465 nm
#a77779
L: 55.06
a: 19.42
b: 6.26
λ*ext: 641 nm
λ*V2: 468.3 nm
#af7378
L: 55.08
a: 24.24
b: 7.05
λ*ext: 639 nm
λ*V2: 471.2 nm
#b77077
L: 55.1
a: 29.08
b: 7.78
λ*ext: 635 nm
λ*V2: 474.6 nm
#be6b76
L: 55.12
a: 33.91
b: 8.54
λ*ext: 633 nm
λ*V2: 476.4 nm
#c56775
L: 55.13
a: 38.75
b: 9.31
λ*ext: 631 nm
λ*V2: 479.3 nm
#cc6274
L: 55.15
a: 43.59
b: 10.05
λ*ext: 627 nm
λ*V2: 482.9 nm
#d35d73
L: 55.17
a: 48.42
b: 10.84
λ*ext: 624 nm
λ*V2: 486.4 nm
#da5772
L: 55.19
a: 53.3
b: 11.5
λ*ext: 619 nm
λ*V2: 491.5 nm
#e05171
L: 55.21
a: 58.14
b: 12.26
λ*ext: 616 nm
λ*V2: 494.3 nm
#e74a70
L: 55.22
a: 63
b: 12.94
λ*ext: 609 nm
λ*V2: 500.7 nm
#ed4170
L: 55.24
a: 67.89
b: 13.57
λ*ext: 603 nm
λ*V2: 506.7 nm
#f4366f
L: 55.24
a: 72.78
b: 14.2
λ*ext: 598 nm
λ*V2: 512.1 nm
#fa286e
L: 55.25
a: 77.66
b: 14.88
λ*ext: 590 nm
λ*V2: 519.5 nm
#a58a88
L: 60.02
a: 10.16
b: 4.92
λ*ext: 629 nm
λ*V2: 480.7 nm
#ae8787
L: 60.04
a: 14.96
b: 5.73
λ*ext: 627 nm
λ*V2: 483.2 nm
