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.
#794336
L: 35.05
a: 21.67
b: 18.23
λ*ext: 696 nm
λ*V2: 413.8 nm
#7f4031
L: 35.06
a: 25.34
b: 21.35
λ*ext: 696 nm
λ*V2: 413.9 nm
#843d2d
L: 35.07
a: 29.04
b: 24.39
λ*ext: 694 nm
λ*V2: 415.2 nm
#893928
L: 35.09
a: 32.75
b: 27.45
λ*ext: 693 nm
λ*V2: 416.4 nm
#8e3523
L: 35.1
a: 36.46
b: 30.57
λ*ext: 692 nm
λ*V2: 417.5 nm
#93311e
L: 35.12
a: 40.19
b: 33.65
λ*ext: 690 nm
λ*V2: 419.7 nm
#982c19
L: 35.13
a: 43.94
b: 36.62
λ*ext: 689 nm
λ*V2: 421.2 nm
#9c2514
L: 35.14
a: 47.69
b: 39.77
λ*ext: 686 nm
λ*V2: 423.5 nm
#a11e0d
L: 35.15
a: 51.45
b: 42.95
λ*ext: 683 nm
λ*V2: 427.1 nm
#a51307
L: 35.14
a: 55.24
b: 46.02
λ*ext: 679 nm
λ*V2: 430.4 nm
#aa0101
L: 35.16
a: 59.02
b: 48.86
λ*ext: 677 nm
λ*V2: 433.3 nm
#6e5954
L: 40.01
a: 7.48
b: 6.18
λ*ext: 688 nm
λ*V2: 421.3 nm
#75574f
L: 40.02
a: 11.05
b: 9.32
λ*ext: 688 nm
λ*V2: 421.2 nm
#7b554a
L: 40.04
a: 14.7
b: 12.32
λ*ext: 686 nm
λ*V2: 423.6 nm
#815246
L: 40.04
a: 18.33
b: 15.46
λ*ext: 688 nm
λ*V2: 422 nm
#874f41
L: 40.05
a: 21.98
b: 18.56
λ*ext: 687 nm
λ*V2: 422.9 nm
#8d4c3c
L: 40.06
a: 25.67
b: 21.59
λ*ext: 685 nm
λ*V2: 424.2 nm
#924937
L: 40.07
a: 29.36
b: 24.66
λ*ext: 685 nm
λ*V2: 425.1 nm
#984532
L: 40.09
a: 33.06
b: 27.77
λ*ext: 684 nm
λ*V2: 426.1 nm
#9d422d
L: 40.1
a: 36.77
b: 30.81
λ*ext: 682 nm
λ*V2: 427.6 nm
#a23d29
L: 40.12
a: 40.49
b: 33.86
λ*ext: 680 nm
λ*V2: 430.2 nm
#a73923
L: 40.13
a: 44.21
b: 36.97
λ*ext: 678 nm
λ*V2: 431.5 nm
#ac331e
L: 40.14
a: 47.95
b: 40.01
λ*ext: 676 nm
λ*V2: 434.2 nm
#b12d19
L: 40.16
a: 51.7
b: 43.07
λ*ext: 673 nm
λ*V2: 436.5 nm
#b52613
L: 40.16
a: 55.47
b: 46.14
λ*ext: 670 nm
λ*V2: 440.2 nm
#ba1c0d
L: 40.16
a: 59.26
b: 49.16
λ*ext: 666 nm
λ*V2: 444 nm
#be0d05
L: 40.15
a: 63.05
b: 52.24
λ*ext: 661 nm
λ*V2: 449.4 nm
#c30000
L: 40.17
a: 66.84
b: 55.04
λ*ext: 657 nm
λ*V2: 452.8 nm
#7b6560
L: 45.01
a: 7.82
b: 6.48
λ*ext: 678 nm
λ*V2: 432.2 nm
#82635b
L: 45.02
a: 11.39
b: 9.61
λ*ext: 677 nm
λ*V2: 432.8 nm
#896056
L: 45.03
a: 15.01
b: 12.69
λ*ext: 676 nm
λ*V2: 433.7 nm
#8f5e51
L: 45.04
a: 18.66
b: 15.74
λ*ext: 676 nm
λ*V2: 434 nm
#965b4c
L: 45.05
a: 22.32
b: 18.8
λ*ext: 675 nm
λ*V2: 434.7 nm
#9b5847
L: 45.06
a: 25.98
b: 21.91
λ*ext: 674 nm
λ*V2: 435.6 nm
#a15542
L: 45.07
a: 29.67
b: 24.96
λ*ext: 673 nm
λ*V2: 436.7 nm
#a7513d
L: 45.08
a: 33.36
b: 28.02
λ*ext: 672 nm
λ*V2: 437.9 nm
#ac4e38
L: 45.1
a: 37.07
b: 31.05
λ*ext: 670 nm
λ*V2: 439.9 nm
#b14a33
L: 45.11
a: 40.79
b: 34.12
λ*ext: 668 nm
λ*V2: 441.4 nm
#b6452e
L: 45.13
a: 44.51
b: 37.21
λ*ext: 666 nm
λ*V2: 444 nm
#bb4129
L: 45.14
a: 48.23
b: 40.27
λ*ext: 664 nm
λ*V2: 446 nm
#c03b24
L: 45.15
a: 51.98
b: 43.31
λ*ext: 662 nm
λ*V2: 448.3 nm
#c5351e
L: 45.17
a: 55.72
b: 46.42
λ*ext: 658 nm
λ*V2: 451.8 nm
#ca2e19
L: 45.18
a: 59.49
b: 49.42
λ*ext: 655 nm
λ*V2: 455.1 nm
#cf2512
L: 45.18
a: 63.26
b: 52.45
λ*ext: 650 nm
λ*V2: 459.9 nm
#d3180a
L: 45.17
a: 67.06
b: 55.53
λ*ext: 645 nm
λ*V2: 465.5 nm
#d80002
L: 45.17
a: 70.86
b: 58.52
λ*ext: 639 nm
λ*V2: 471 nm
#dc0000
L: 45.14
a: 74.68
b: 61.64
λ*ext: 632 nm
λ*V2: 478.1 nm
#89716b
L: 50.01
a: 8.19
b: 6.71
λ*ext: 664 nm
λ*V2: 446 nm
#906f66
L: 50.02
a: 11.76
b: 9.84
λ*ext: 663 nm
λ*V2: 446.4 nm
#976c61
L: 50.03
a: 15.36
b: 12.93
λ*ext: 662 nm
λ*V2: 447.6 nm
#9e6a5c
L: 50.04
a: 19.01
b: 16
λ*ext: 662 nm
λ*V2: 447.9 nm
#a46757
L: 50.05
a: 22.66
b: 19.05
λ*ext: 661 nm
λ*V2: 448.8 nm
#aa6452
L: 50.06
a: 26.33
b: 22.11
λ*ext: 659 nm
λ*V2: 450.5 nm
#b0614d
L: 50.07
a: 30.01
b: 25.16
λ*ext: 659 nm
λ*V2: 451.3 nm
#b65e48
L: 50.08
a: 33.68
b: 28.26
λ*ext: 657 nm
λ*V2: 452.4 nm
#bb5a43
L: 50.09
a: 37.38
b: 31.33
λ*ext: 656 nm
λ*V2: 453.9 nm
#c1563e
L: 50.11
a: 41.09
b: 34.38
λ*ext: 654 nm
λ*V2: 455.9 nm
#c65239
L: 50.13
a: 44.8
b: 37.43
λ*ext: 652 nm
λ*V2: 457.7 nm
#cb4e34
L: 50.14
a: 48.52
b: 40.5
λ*ext: 649 nm
λ*V2: 460.6 nm
#d0492f
L: 50.16
a: 52.25
b: 43.58
λ*ext: 647 nm
λ*V2: 462.8 nm
#d64329
L: 50.17
a: 55.99
b: 46.63
λ*ext: 644 nm
λ*V2: 466.1 nm
#da3d24
L: 50.18
a: 59.74
b: 49.72
λ*ext: 641 nm
λ*V2: 469.5 nm
#df361e
L: 50.19
a: 63.5
b: 52.79
λ*ext: 637 nm
λ*V2: 473.2 nm
#e42d18
L: 50.2
a: 67.26
b: 55.81
λ*ext: 632 nm
λ*V2: 477.7 nm
#e92211
L: 50.19
a: 71.06
b: 58.77
λ*ext: 625 nm
λ*V2: 484.8 nm
#ee0f07
L: 50.19
a: 74.85
b: 61.87
λ*ext: 619 nm
λ*V2: 491.4 nm
#977e78
L: 55.01
a: 8.55
b: 6.97
λ*ext: 649 nm
λ*V2: 461.1 nm
#9e7b72
L: 55.02
a: 12.11
b: 10.1
λ*ext: 648 nm
λ*V2: 462.3 nm
#a5796d
L: 55.04
a: 15.73
b: 13.16
λ*ext: 646 nm
λ*V2: 464 nm
#ac7668
L: 55.04
a: 19.36
b: 16.25
λ*ext: 647 nm
λ*V2: 463.3 nm
#b37363
L: 55.05
a: 23
b: 19.32
λ*ext: 646 nm
λ*V2: 464.1 nm
#b9705e
L: 55.06
a: 26.66
b: 22.39
λ*ext: 644 nm
λ*V2: 466 nm
#bf6d59
L: 55.07
a: 30.33
b: 25.46
λ*ext: 643 nm
λ*V2: 466.5 nm
#c56a54
L: 55.08
a: 34.01
b: 28.51
λ*ext: 642 nm
λ*V2: 467.8 nm
#cb674f
L: 55.09
a: 37.7
b: 31.58
λ*ext: 640 nm
λ*V2: 470 nm
#d0634a
L: 55.11
a: 41.4
b: 34.62
λ*ext: 638 nm
λ*V2: 472 nm
#d65f45
L: 55.12
a: 45.11
b: 37.69
λ*ext: 636 nm
λ*V2: 473.8 nm
#db5b3f
L: 55.13
a: 48.83
b: 40.74
λ*ext: 634 nm
λ*V2: 476 nm
#e1563a
L: 55.15
a: 52.55
b: 43.82
λ*ext: 631 nm
λ*V2: 478.9 nm
#e65135
L: 55.16
a: 56.28
b: 46.89
λ*ext: 628 nm
λ*V2: 482.5 nm
#eb4b2f
L: 55.18
a: 60.01
b: 49.96
λ*ext: 623 nm
λ*V2: 486.7 nm
#f0452a
L: 55.19
a: 63.76
b: 53.02
λ*ext: 620 nm
λ*V2: 490.3 nm
#f53e23
L: 55.2
a: 67.51
b: 56.12
λ*ext: 614 nm
λ*V2: 496.3 nm
#fa351d
L: 55.21
a: 71.28
b: 59.11
λ*ext: 609 nm
λ*V2: 500.9 nm
#ff2b16
L: 55.21
a: 75.06
b: 62.14
λ*ext: 605 nm
λ*V2: 504.8 nm
#a58a84
L: 60.01
a: 8.91
b: 7.23
λ*ext: 632 nm
λ*V2: 478.2 nm
#ac887f
L: 60.02
a: 12.48
b: 10.34
λ*ext: 630 nm
λ*V2: 479.7 nm
#b48579
L: 60.03
a: 16.08
b: 13.42
λ*ext: 629 nm
λ*V2: 480.9 nm
#bb8374
L: 60.04
a: 19.71
b: 16.49
λ*ext: 629 nm
λ*V2: 481 nm
#c2806f
L: 60.05
a: 23.37
b: 19.52
λ*ext: 627 nm
λ*V2: 482.9 nm
#c87d6a
L: 60.06
a: 27.01
b: 22.6
λ*ext: 625 nm
λ*V2: 484.6 nm
#ce7a65
L: 60.07
a: 30.67
b: 25.69
λ*ext: 625 nm
λ*V2: 485 nm
#d47760
L: 60.08
a: 34.36
b: 28.7
λ*ext: 622 nm
λ*V2: 487.7 nm
#da735a
L: 60.09
a: 38.03
b: 31.81
λ*ext: 621 nm
λ*V2: 489 nm
#e07055
L: 60.1
a: 41.72
b: 34.9
λ*ext: 620 nm
λ*V2: 490 nm
#e66c50
L: 60.12
a: 45.42
b: 37.94
λ*ext: 617 nm
λ*V2: 493.3 nm
#ec684b
L: 60.13
a: 49.13
b: 41.02
λ*ext: 614 nm
λ*V2: 495.7 nm
#f16345
L: 60.15
a: 52.84
b: 44.07
λ*ext: 612 nm
λ*V2: 498.3 nm
#f65e40
L: 60.16
a: 56.57
b: 47.1
λ*ext: 608 nm
λ*V2: 502 nm
#fc593b
L: 60.18
a: 60.29
b: 50.21
λ*ext: 604 nm
λ*V2: 506 nm
