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.
#13100f
L: 5
a: 1.15
b: 0.66
λ*ext: 727 nm
λ*V2: 382.2 nm
#1e1a19
L: 10
a: 1.86
b: 1.36
λ*ext: 725 nm
λ*V2: 384.4 nm
#292423
L: 15
a: 2.17
b: 1.72
λ*ext: 722 nm
λ*V2: 387.4 nm
#352f2d
L: 20.01
a: 2.48
b: 2.01
λ*ext: 718 nm
λ*V2: 391.4 nm
#413938
L: 25.01
a: 2.85
b: 2.27
λ*ext: 713 nm
λ*V2: 396.8 nm
#4d4442
L: 30.01
a: 3.19
b: 2.58
λ*ext: 706 nm
λ*V2: 403.1 nm
#59504d
L: 35.01
a: 3.55
b: 2.84
λ*ext: 698 nm
λ*V2: 411.2 nm
#665b59
L: 40.01
a: 3.9
b: 3.12
λ*ext: 689 nm
λ*V2: 420.7 nm
#746765
L: 45.01
a: 4.25
b: 3.37
λ*ext: 677 nm
λ*V2: 432.3 nm
#817470
L: 50.01
a: 4.62
b: 3.63
λ*ext: 664 nm
λ*V2: 445.4 nm
#8f807d
L: 55.01
a: 4.99
b: 3.87
λ*ext: 649 nm
λ*V2: 460.8 nm
#9d8d89
L: 60.01
a: 5.35
b: 4.12
λ*ext: 632 nm
λ*V2: 477.7 nm
#ab9a96
L: 65.01
a: 5.74
b: 4.32
λ*ext: 611 nm
λ*V2: 498.7 nm
#b9a7a3
L: 70.01
a: 6.12
b: 4.54
λ*ext: 589 nm
λ*V2: 520.6 nm
#c8b4b0
L: 75.01
a: 6.51
b: 4.75
λ*ext: 564 nm
λ*V2: 545.6 nm
#d7c1bd
L: 80
a: 6.89
b: 4.99
λ*ext: 537 nm
λ*V2: 573 nm
#e6cfca
L: 85
a: 7.26
b: 5.22
λ*ext: 506 nm
λ*V2: 604.2 nm
#f5ddd8
L: 90
a: 7.63
b: 5.45
λ*ext: 472 nm
λ*V2: 638.4 nm
#ffebe6
L: 95
a: 8.02
b: 5.66
λ*ext: 432 nm
λ*V2: 677.9 nm
#1a0d0f
L: 5.01
a: 6.25
b: 0.99
λ*ext: 727 nm
λ*V2: 382.5 nm
#20090e
L: 5.01
a: 11.35
b: 1.26
λ*ext: 726 nm
λ*V2: 383.3 nm
#251819
L: 10.03
a: 6.67
b: 1.88
λ*ext: 725 nm
λ*V2: 384.7 nm
#2b1519
L: 10.05
a: 11.64
b: 2.15
λ*ext: 724 nm
λ*V2: 385.2 nm
#301118
L: 10.06
a: 16.57
b: 2.48
λ*ext: 724 nm
λ*V2: 385.7 nm
#350c18
L: 10.06
a: 21.6
b: 2.58
λ*ext: 723 nm
λ*V2: 386.7 nm
#302222
L: 15.02
a: 7.06
b: 2.11
λ*ext: 722 nm
λ*V2: 387.9 nm
#361f22
L: 15.04
a: 11.97
b: 2.44
λ*ext: 721 nm
λ*V2: 388.7 nm
#3c1b22
L: 15.07
a: 16.85
b: 2.82
λ*ext: 720 nm
λ*V2: 389.2 nm
#421722
L: 15.07
a: 21.8
b: 3.12
λ*ext: 720 nm
λ*V2: 390 nm
#471222
L: 15.09
a: 26.78
b: 3.32
λ*ext: 718 nm
λ*V2: 391.2 nm
#4c0a22
L: 15.09
a: 31.8
b: 3.38
λ*ext: 717 nm
λ*V2: 392.8 nm
#3c2c2d
L: 20.03
a: 7.39
b: 2.4
λ*ext: 717 nm
λ*V2: 392.1 nm
#42292c
L: 20.04
a: 12.31
b: 2.75
λ*ext: 717 nm
λ*V2: 392.6 nm
#49262c
L: 20.07
a: 17.22
b: 3.08
λ*ext: 716 nm
λ*V2: 394 nm
#4e222c
L: 20.08
a: 22.12
b: 3.48
λ*ext: 715 nm
λ*V2: 394.3 nm
#541d2c
L: 20.11
a: 27.05
b: 3.75
λ*ext: 713 nm
λ*V2: 396.2 nm
#5a172b
L: 20.11
a: 32.02
b: 4
λ*ext: 712 nm
λ*V2: 397.1 nm
#5f0f2b
L: 20.12
a: 37.03
b: 4.12
λ*ext: 710 nm
λ*V2: 399.3 nm
#65022c
L: 20.13
a: 42.04
b: 4.18
λ*ext: 708 nm
λ*V2: 401.2 nm
#483737
L: 25.02
a: 7.72
b: 2.71
λ*ext: 712 nm
λ*V2: 397.2 nm
#4f3437
L: 25.05
a: 12.63
b: 3.07
λ*ext: 711 nm
λ*V2: 398.1 nm
#553036
L: 25.06
a: 17.52
b: 3.43
λ*ext: 710 nm
λ*V2: 399.2 nm
#5b2d36
L: 25.08
a: 22.45
b: 3.78
λ*ext: 709 nm
λ*V2: 400.8 nm
#622836
L: 25.1
a: 27.36
b: 4.13
λ*ext: 708 nm
λ*V2: 401.9 nm
#672336
L: 25.12
a: 32.31
b: 4.4
λ*ext: 706 nm
λ*V2: 403.6 nm
#6d1d36
L: 25.13
a: 37.27
b: 4.65
λ*ext: 704 nm
λ*V2: 405.2 nm
#731436
L: 25.14
a: 42.23
b: 4.85
λ*ext: 702 nm
λ*V2: 407.5 nm
#780536
L: 25.14
a: 47.33
b: 4.74
λ*ext: 699 nm
λ*V2: 410.4 nm
#544242
L: 30.02
a: 8.08
b: 2.97
λ*ext: 705 nm
λ*V2: 404.1 nm
#5b3f42
L: 30.04
a: 12.98
b: 3.35
λ*ext: 705 nm
λ*V2: 404.8 nm
#623c41
L: 30.06
a: 17.88
b: 3.73
λ*ext: 704 nm
λ*V2: 405.7 nm
#693841
L: 30.08
a: 22.8
b: 4.05
λ*ext: 702 nm
λ*V2: 407.8 nm
#6f3441
L: 30.1
a: 27.7
b: 4.4
λ*ext: 700 nm
λ*V2: 410 nm
#752f40
L: 30.12
a: 32.63
b: 4.72
λ*ext: 698 nm
λ*V2: 411.5 nm
#7b2940
L: 30.14
a: 37.57
b: 5
λ*ext: 696 nm
λ*V2: 413.5 nm
#812240
L: 30.15
a: 42.53
b: 5.26
λ*ext: 694 nm
λ*V2: 415.7 nm
#871940
L: 30.17
a: 47.51
b: 5.4
λ*ext: 691 nm
λ*V2: 418.6 nm
#8d0a40
L: 30.16
a: 52.56
b: 5.44
λ*ext: 688 nm
λ*V2: 421.7 nm
#920041
L: 30.18
a: 57.55
b: 5.5
λ*ext: 685 nm
λ*V2: 424.7 nm
#614d4d
L: 35.02
a: 8.42
b: 3.26
λ*ext: 698 nm
λ*V2: 411.8 nm
#694a4d
L: 35.05
a: 13.34
b: 3.58
λ*ext: 696 nm
λ*V2: 413.8 nm
#70474c
L: 35.06
a: 18.24
b: 3.99
λ*ext: 695 nm
λ*V2: 414.8 nm
#76434c
L: 35.09
a: 23.13
b: 4.34
λ*ext: 693 nm
λ*V2: 416.9 nm
#7d3f4c
L: 35.11
a: 28.04
b: 4.69
λ*ext: 691 nm
λ*V2: 419 nm
#833b4b
L: 35.12
a: 32.96
b: 5.03
λ*ext: 689 nm
λ*V2: 421 nm
#8a364b
L: 35.14
a: 37.89
b: 5.34
λ*ext: 687 nm
λ*V2: 422.7 nm
#902f4b
L: 35.16
a: 42.83
b: 5.62
λ*ext: 684 nm
λ*V2: 425.6 nm
#96284b
L: 35.17
a: 47.8
b: 5.82
λ*ext: 681 nm
λ*V2: 428.6 nm
#9c1f4b
L: 35.18
a: 52.77
b: 6.04
λ*ext: 679 nm
λ*V2: 431.1 nm
#a2104b
L: 35.19
a: 57.8
b: 6.07
λ*ext: 674 nm
λ*V2: 435.7 nm
#a8004b
L: 35.19
a: 62.84
b: 6.06
λ*ext: 670 nm
λ*V2: 439.5 nm
#6e5958
L: 40.02
a: 8.79
b: 3.5
λ*ext: 687 nm
λ*V2: 422.2 nm
#765658
L: 40.05
a: 13.7
b: 3.84
λ*ext: 686 nm
λ*V2: 424.2 nm
#7d5258
L: 40.06
a: 18.58
b: 4.26
λ*ext: 684 nm
λ*V2: 425.3 nm
#844f57
L: 40.09
a: 23.48
b: 4.63
λ*ext: 682 nm
λ*V2: 427.2 nm
#8b4b57
L: 40.11
a: 28.38
b: 4.98
λ*ext: 680 nm
λ*V2: 430 nm
#924757
L: 40.12
a: 33.31
b: 5.31
λ*ext: 678 nm
λ*V2: 432.1 nm
#984256
L: 40.14
a: 38.23
b: 5.63
λ*ext: 675 nm
λ*V2: 434.5 nm
#9e3c56
L: 40.16
a: 43.16
b: 5.91
λ*ext: 673 nm
λ*V2: 437.1 nm
#a53656
L: 40.18
a: 48.1
b: 6.21
λ*ext: 670 nm
λ*V2: 439.9 nm
#ab2e56
L: 40.19
a: 53.06
b: 6.44
λ*ext: 667 nm
λ*V2: 443.3 nm
#b12456
L: 40.2
a: 58.05
b: 6.59
λ*ext: 662 nm
λ*V2: 447.4 nm
#b71556
L: 40.21
a: 63.06
b: 6.65
λ*ext: 657 nm
λ*V2: 452.6 nm
#bd0057
L: 40.2
a: 68.14
b: 6.6
λ*ext: 653 nm
λ*V2: 457 nm
#c30057
L: 40.21
a: 73.13
b: 6.71
λ*ext: 648 nm
λ*V2: 461.8 nm
#7c6564
L: 45.03
a: 9.15
b: 3.75
λ*ext: 676 nm
λ*V2: 433.9 nm
#836264
L: 45.04
a: 14.05
b: 4.13
λ*ext: 674 nm
λ*V2: 435.5 nm
#8b5e63
L: 45.07
a: 18.95
b: 4.47
λ*ext: 671 nm
λ*V2: 438.5 nm
#925b63
L: 45.09
a: 23.83
b: 4.88
λ*ext: 670 nm
λ*V2: 440 nm
#995763
L: 45.11
a: 28.74
b: 5.24
λ*ext: 668 nm
λ*V2: 442.2 nm
#a05362
L: 45.12
a: 33.66
b: 5.58
λ*ext: 665 nm
λ*V2: 445 nm
#a74e62
L: 45.14
a: 38.59
b: 5.89
λ*ext: 662 nm
λ*V2: 448 nm
#ad4962
L: 45.16
a: 43.52
b: 6.18
λ*ext: 659 nm
λ*V2: 451 nm
#b44362
L: 45.18
a: 48.46
b: 6.46
λ*ext: 656 nm
λ*V2: 454.3 nm
#ba3c62
L: 45.2
a: 53.39
b: 6.73
λ*ext: 652 nm
λ*V2: 458.2 nm
#c13462
L: 45.21
a: 58.37
b: 6.9
λ*ext: 647 nm
λ*V2: 463 nm
#c72961
L: 45.22
a: 63.33
b: 7.15
λ*ext: 643 nm
λ*V2: 467.4 nm
#cd1b62
L: 45.23
a: 68.32
b: 7.27
λ*ext: 638 nm
λ*V2: 472 nm
#d30062
L: 45.22
a: 73.39
b: 7.25
λ*ext: 632 nm
λ*V2: 477.6 nm
#d90062
L: 45.23
a: 78.43
b: 7.22
λ*ext: 626 nm
λ*V2: 483.7 nm
