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.
#5b2f2a
L: 25.06
a: 19.45
b: 11.79
λ*ext: 711 nm
λ*V2: 398.7 nm
#602b27
L: 25.07
a: 23.64
b: 14.22
λ*ext: 710 nm
λ*V2: 399.3 nm
#662723
L: 25.08
a: 27.85
b: 16.57
λ*ext: 709 nm
λ*V2: 400.3 nm
#6b2220
L: 25.1
a: 32.08
b: 18.9
λ*ext: 708 nm
λ*V2: 401.9 nm
#701d1d
L: 25.11
a: 36.32
b: 21.25
λ*ext: 707 nm
λ*V2: 403.1 nm
#75151a
L: 25.12
a: 40.59
b: 23.54
λ*ext: 704 nm
λ*V2: 405.4 nm
#7a0a17
L: 25.12
a: 44.88
b: 25.74
λ*ext: 702 nm
λ*V2: 407.8 nm
#54423f
L: 30.02
a: 7.3
b: 4.96
λ*ext: 706 nm
λ*V2: 403.4 nm
#5b3f3b
L: 30.03
a: 11.44
b: 7.37
λ*ext: 706 nm
λ*V2: 403.9 nm
#623d38
L: 30.04
a: 15.59
b: 9.75
λ*ext: 705 nm
λ*V2: 404.3 nm
#683a34
L: 30.05
a: 19.79
b: 12.12
λ*ext: 704 nm
λ*V2: 405.3 nm
#6e3631
L: 30.07
a: 23.97
b: 14.49
λ*ext: 703 nm
λ*V2: 406.4 nm
#73322e
L: 30.08
a: 28.17
b: 16.85
λ*ext: 702 nm
λ*V2: 407.2 nm
#792e2a
L: 30.1
a: 32.4
b: 19.15
λ*ext: 701 nm
λ*V2: 408.9 nm
#7e2927
L: 30.11
a: 36.62
b: 21.53
λ*ext: 699 nm
λ*V2: 410.7 nm
#842324
L: 30.13
a: 40.84
b: 23.89
λ*ext: 697 nm
λ*V2: 412.5 nm
#891c21
L: 30.14
a: 45.09
b: 26.14
λ*ext: 695 nm
λ*V2: 414.9 nm
#8e111e
L: 30.13
a: 49.42
b: 28.31
λ*ext: 692 nm
λ*V2: 417.9 nm
#93001a
L: 30.14
a: 53.67
b: 30.58
λ*ext: 689 nm
λ*V2: 421 nm
#614d4a
L: 35.02
a: 7.66
b: 5.23
λ*ext: 698 nm
λ*V2: 411.4 nm
#684b46
L: 35.03
a: 11.78
b: 7.66
λ*ext: 698 nm
λ*V2: 411.9 nm
#6f4843
L: 35.04
a: 15.93
b: 10.03
λ*ext: 697 nm
λ*V2: 413.1 nm
#75453f
L: 35.05
a: 20.1
b: 12.42
λ*ext: 696 nm
λ*V2: 413.8 nm
#7c423c
L: 35.07
a: 24.29
b: 14.78
λ*ext: 695 nm
λ*V2: 414.8 nm
#823e38
L: 35.08
a: 28.48
b: 17.16
λ*ext: 694 nm
λ*V2: 416 nm
#873a35
L: 35.1
a: 32.69
b: 19.51
λ*ext: 692 nm
λ*V2: 417.6 nm
#8d3531
L: 35.12
a: 36.91
b: 21.84
λ*ext: 690 nm
λ*V2: 419.8 nm
#92302e
L: 35.13
a: 41.15
b: 24.2
λ*ext: 689 nm
λ*V2: 421 nm
#982a2b
L: 35.14
a: 45.38
b: 26.49
λ*ext: 687 nm
λ*V2: 423.2 nm
#9d2327
L: 35.16
a: 49.63
b: 28.78
λ*ext: 684 nm
λ*V2: 426 nm
#a21824
L: 35.16
a: 53.92
b: 31.03
λ*ext: 680 nm
λ*V2: 429.8 nm
#a70721
L: 35.15
a: 58.23
b: 33.14
λ*ext: 675 nm
λ*V2: 434.6 nm
#6e5955
L: 40.02
a: 8.01
b: 5.5
λ*ext: 688 nm
λ*V2: 421.3 nm
#765651
L: 40.03
a: 12.13
b: 7.92
λ*ext: 687 nm
λ*V2: 422.3 nm
#7d544e
L: 40.04
a: 16.26
b: 10.33
λ*ext: 687 nm
λ*V2: 423.1 nm
#83514a
L: 40.05
a: 20.45
b: 12.66
λ*ext: 686 nm
λ*V2: 423.9 nm
#8a4d47
L: 40.06
a: 24.63
b: 15.04
λ*ext: 685 nm
λ*V2: 424.8 nm
#904a43
L: 40.08
a: 28.83
b: 17.4
λ*ext: 684 nm
λ*V2: 426.1 nm
#96463f
L: 40.09
a: 33.02
b: 19.78
λ*ext: 682 nm
λ*V2: 427.8 nm
#9c423c
L: 40.11
a: 37.23
b: 22.11
λ*ext: 680 nm
λ*V2: 430.2 nm
#a13d39
L: 40.13
a: 41.45
b: 24.45
λ*ext: 677 nm
λ*V2: 432.7 nm
#a73735
L: 40.14
a: 45.68
b: 26.78
λ*ext: 675 nm
λ*V2: 434.5 nm
#ac3132
L: 40.15
a: 49.92
b: 29.13
λ*ext: 673 nm
λ*V2: 436.9 nm
#b2292e
L: 40.16
a: 54.18
b: 31.37
λ*ext: 669 nm
λ*V2: 440.6 nm
#b71f2b
L: 40.17
a: 58.45
b: 33.58
λ*ext: 665 nm
λ*V2: 445.2 nm
#bc1028
L: 40.17
a: 62.75
b: 35.78
λ*ext: 662 nm
λ*V2: 448.2 nm
#c20025
L: 40.18
a: 67.03
b: 37.97
λ*ext: 657 nm
λ*V2: 453.2 nm
#7c6561
L: 45.02
a: 8.37
b: 5.78
λ*ext: 677 nm
λ*V2: 432.7 nm
#83625d
L: 45.03
a: 12.49
b: 8.16
λ*ext: 675 nm
λ*V2: 434.5 nm
#8a5f59
L: 45.04
a: 16.62
b: 10.56
λ*ext: 674 nm
λ*V2: 435.3 nm
#915c56
L: 45.05
a: 20.79
b: 12.95
λ*ext: 674 nm
λ*V2: 435.6 nm
#985952
L: 45.06
a: 24.98
b: 15.28
λ*ext: 673 nm
λ*V2: 437.3 nm
#9e564e
L: 45.08
a: 29.16
b: 17.65
λ*ext: 671 nm
λ*V2: 439 nm
#a5524b
L: 45.1
a: 33.35
b: 20.02
λ*ext: 669 nm
λ*V2: 440.8 nm
#ab4e47
L: 45.11
a: 37.56
b: 22.35
λ*ext: 667 nm
λ*V2: 442.8 nm
#b14943
L: 45.13
a: 41.76
b: 24.74
λ*ext: 665 nm
λ*V2: 444.8 nm
#b64440
L: 45.14
a: 45.99
b: 27.05
λ*ext: 663 nm
λ*V2: 447 nm
#bc3e3c
L: 45.16
a: 50.22
b: 29.37
λ*ext: 660 nm
λ*V2: 450 nm
#c23839
L: 45.17
a: 54.46
b: 31.7
λ*ext: 656 nm
λ*V2: 453.5 nm
#c73035
L: 45.18
a: 58.71
b: 33.98
λ*ext: 652 nm
λ*V2: 457.6 nm
#cd2632
L: 45.19
a: 62.97
b: 36.3
λ*ext: 649 nm
λ*V2: 461.4 nm
#d2192f
L: 45.19
a: 67.27
b: 38.42
λ*ext: 643 nm
λ*V2: 467.2 nm
#d7002c
L: 45.18
a: 71.59
b: 40.55
λ*ext: 636 nm
λ*V2: 474.2 nm
#dc0028
L: 45.18
a: 75.86
b: 42.78
λ*ext: 632 nm
λ*V2: 478 nm
#89716d
L: 50.02
a: 8.73
b: 6.02
λ*ext: 664 nm
λ*V2: 446.2 nm
#916e69
L: 50.03
a: 12.84
b: 8.45
λ*ext: 663 nm
λ*V2: 447 nm
#986c65
L: 50.04
a: 16.98
b: 10.82
λ*ext: 661 nm
λ*V2: 449.2 nm
#a06961
L: 50.05
a: 21.15
b: 13.17
λ*ext: 660 nm
λ*V2: 450.2 nm
#a6655d
L: 50.06
a: 25.32
b: 15.55
λ*ext: 659 nm
λ*V2: 451.1 nm
#ad625a
L: 50.08
a: 29.5
b: 17.91
λ*ext: 657 nm
λ*V2: 452.6 nm
#b45e56
L: 50.09
a: 33.69
b: 20.28
λ*ext: 655 nm
λ*V2: 454.7 nm
#ba5a52
L: 50.11
a: 37.89
b: 22.64
λ*ext: 654 nm
λ*V2: 456.1 nm
#c0564f
L: 50.12
a: 42.09
b: 25.01
λ*ext: 651 nm
λ*V2: 458.4 nm
#c6514b
L: 50.14
a: 46.3
b: 27.33
λ*ext: 649 nm
λ*V2: 461 nm
#cc4c47
L: 50.16
a: 50.53
b: 29.67
λ*ext: 645 nm
λ*V2: 465 nm
#d24644
L: 50.17
a: 54.76
b: 31.99
λ*ext: 642 nm
λ*V2: 468.4 nm
#d73f40
L: 50.18
a: 58.99
b: 34.34
λ*ext: 638 nm
λ*V2: 471.8 nm
#dd373d
L: 50.2
a: 63.24
b: 36.62
λ*ext: 634 nm
λ*V2: 476.3 nm
#e22e39
L: 50.2
a: 67.52
b: 38.86
λ*ext: 629 nm
λ*V2: 480.9 nm
#e82136
L: 50.21
a: 71.79
b: 41.11
λ*ext: 622 nm
λ*V2: 487.8 nm
#ed0933
L: 50.2
a: 76.09
b: 43.33
λ*ext: 615 nm
λ*V2: 495.7 nm
#977d79
L: 55.02
a: 9.1
b: 6.27
λ*ext: 648 nm
λ*V2: 461.8 nm
#9f7b75
L: 55.03
a: 13.2
b: 8.69
λ*ext: 647 nm
λ*V2: 462.8 nm
#a77871
L: 55.04
a: 17.33
b: 11.08
λ*ext: 645 nm
λ*V2: 464.8 nm
#ae756d
L: 55.05
a: 21.5
b: 13.43
λ*ext: 644 nm
λ*V2: 466.2 nm
#b57269
L: 55.07
a: 25.68
b: 15.76
λ*ext: 642 nm
λ*V2: 467.9 nm
#bc6e65
L: 55.08
a: 29.85
b: 18.18
λ*ext: 641 nm
λ*V2: 468.9 nm
#c36b62
L: 55.09
a: 34.04
b: 20.51
λ*ext: 639 nm
λ*V2: 471 nm
#c9675e
L: 55.11
a: 38.24
b: 22.85
λ*ext: 636 nm
λ*V2: 473.7 nm
#cf625a
L: 55.12
a: 42.43
b: 25.22
λ*ext: 634 nm
λ*V2: 476.4 nm
#d65e56
L: 55.14
a: 46.63
b: 27.59
λ*ext: 632 nm
λ*V2: 478.2 nm
#dc5953
L: 55.16
a: 50.85
b: 29.92
λ*ext: 628 nm
λ*V2: 482.2 nm
#e2534f
L: 55.17
a: 55.06
b: 32.31
λ*ext: 626 nm
λ*V2: 484.5 nm
#e84d4b
L: 55.18
a: 59.3
b: 34.59
λ*ext: 621 nm
λ*V2: 488.8 nm
#ed4648
L: 55.2
a: 63.54
b: 36.86
λ*ext: 616 nm
λ*V2: 494.2 nm
#f33e44
L: 55.21
a: 67.79
b: 39.2
λ*ext: 611 nm
λ*V2: 498.7 nm
#f93541
L: 55.22
a: 72.05
b: 41.44
λ*ext: 604 nm
λ*V2: 506 nm
#fe283d
L: 55.22
a: 76.31
b: 43.79
λ*ext: 601 nm
λ*V2: 508.8 nm
#a58a85
L: 60.02
a: 9.45
b: 6.53
λ*ext: 631 nm
λ*V2: 479.1 nm
#ad8781
L: 60.03
a: 13.57
b: 8.93
λ*ext: 629 nm
λ*V2: 481.1 nm
