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.
#7d5440
L: 40.02
a: 14.34
b: 18.94
λ*ext: 689 nm
λ*V2: 420.7 nm
#825239
L: 40.02
a: 17.01
b: 22.91
λ*ext: 689 nm
λ*V2: 420.6 nm
#875033
L: 40.02
a: 19.71
b: 26.88
λ*ext: 689 nm
λ*V2: 420.5 nm
#8b4e2c
L: 40.03
a: 22.44
b: 30.79
λ*ext: 689 nm
λ*V2: 421.2 nm
#8f4c25
L: 40.04
a: 25.18
b: 34.74
λ*ext: 688 nm
λ*V2: 421.7 nm
#93491e
L: 40.05
a: 27.93
b: 38.75
λ*ext: 688 nm
λ*V2: 422.1 nm
#974716
L: 40.06
a: 30.7
b: 42.68
λ*ext: 687 nm
λ*V2: 422.8 nm
#9b440c
L: 40.07
a: 33.47
b: 46.64
λ*ext: 686 nm
λ*V2: 423.8 nm
#9f4100
L: 40.09
a: 36.25
b: 50.66
λ*ext: 685 nm
λ*V2: 424.5 nm
#a33e00
L: 40.1
a: 39.04
b: 54.7
λ*ext: 684 nm
λ*V2: 426.3 nm
#a63b00
L: 40.12
a: 41.84
b: 58.54
λ*ext: 682 nm
λ*V2: 428.1 nm
#7a665e
L: 45.01
a: 6.82
b: 7.34
λ*ext: 678 nm
λ*V2: 431.5 nm
#806458
L: 45.01
a: 9.39
b: 11.31
λ*ext: 678 nm
λ*V2: 431.7 nm
#866251
L: 45.01
a: 12
b: 15.3
λ*ext: 678 nm
λ*V2: 431.6 nm
#8b604b
L: 45.01
a: 14.65
b: 19.27
λ*ext: 679 nm
λ*V2: 430.8 nm
#905e44
L: 45.02
a: 17.34
b: 23.19
λ*ext: 678 nm
λ*V2: 431.6 nm
#955c3e
L: 45.02
a: 20.03
b: 27.13
λ*ext: 678 nm
λ*V2: 431.9 nm
#9a5a37
L: 45.03
a: 22.74
b: 31.09
λ*ext: 678 nm
λ*V2: 432.2 nm
#9e5830
L: 45.04
a: 25.47
b: 35.04
λ*ext: 677 nm
λ*V2: 432.4 nm
#a25529
L: 45.05
a: 28.22
b: 38.89
λ*ext: 675 nm
λ*V2: 434.7 nm
#a75321
L: 45.06
a: 30.97
b: 42.92
λ*ext: 676 nm
λ*V2: 434 nm
#ab5019
L: 45.07
a: 33.73
b: 46.95
λ*ext: 675 nm
λ*V2: 434.7 nm
#ae4e0f
L: 45.08
a: 36.51
b: 50.87
λ*ext: 674 nm
λ*V2: 436.3 nm
#b24b01
L: 45.09
a: 39.29
b: 54.86
λ*ext: 673 nm
λ*V2: 437.2 nm
#b64700
L: 45.11
a: 42.08
b: 58.89
λ*ext: 671 nm
λ*V2: 439.1 nm
#ba4400
L: 45.12
a: 44.88
b: 62.92
λ*ext: 669 nm
λ*V2: 441 nm
#88726a
L: 50.01
a: 7.17
b: 7.61
λ*ext: 665 nm
λ*V2: 444.7 nm
#8e7063
L: 50.01
a: 9.74
b: 11.59
λ*ext: 665 nm
λ*V2: 445.2 nm
#946e5d
L: 50.01
a: 12.36
b: 15.54
λ*ext: 665 nm
λ*V2: 444.8 nm
#996c56
L: 50.01
a: 15
b: 19.49
λ*ext: 665 nm
λ*V2: 444.5 nm
#9f6a50
L: 50.02
a: 17.67
b: 23.43
λ*ext: 665 nm
λ*V2: 444.6 nm
#a46849
L: 50.02
a: 20.35
b: 27.4
λ*ext: 665 nm
λ*V2: 444.6 nm
#a86642
L: 50.03
a: 23.06
b: 31.34
λ*ext: 664 nm
λ*V2: 445.4 nm
#ad643b
L: 50.04
a: 25.78
b: 35.28
λ*ext: 664 nm
λ*V2: 445.6 nm
#b16234
L: 50.05
a: 28.52
b: 39.13
λ*ext: 662 nm
λ*V2: 448 nm
#b65f2d
L: 50.05
a: 31.24
b: 43.2
λ*ext: 663 nm
λ*V2: 447.3 nm
#ba5d25
L: 50.07
a: 34.01
b: 47.12
λ*ext: 661 nm
λ*V2: 448.7 nm
#be5a1c
L: 50.08
a: 36.78
b: 51.09
λ*ext: 660 nm
λ*V2: 449.4 nm
#c25712
L: 50.09
a: 39.54
b: 55.09
λ*ext: 659 nm
λ*V2: 450.8 nm
#c65402
L: 50.1
a: 42.33
b: 59.1
λ*ext: 657 nm
λ*V2: 452.5 nm
#ca5100
L: 50.11
a: 45.12
b: 63.13
λ*ext: 656 nm
λ*V2: 453.6 nm
#ce4d00
L: 50.13
a: 47.92
b: 67.09
λ*ext: 654 nm
λ*V2: 456.2 nm
#d14a00
L: 50.14
a: 50.73
b: 71.12
λ*ext: 652 nm
λ*V2: 457.9 nm
#d54600
L: 50.16
a: 53.55
b: 74.94
λ*ext: 650 nm
λ*V2: 460.4 nm
#967e76
L: 55.01
a: 7.55
b: 7.81
λ*ext: 649 nm
λ*V2: 461 nm
#9c7d6f
L: 55.01
a: 10.1
b: 11.84
λ*ext: 649 nm
λ*V2: 460.4 nm
#a27b69
L: 55.02
a: 12.72
b: 15.73
λ*ext: 648 nm
λ*V2: 461.8 nm
#a87962
L: 55.01
a: 15.35
b: 19.74
λ*ext: 650 nm
λ*V2: 459.7 nm
#ad775b
L: 55.02
a: 18
b: 23.69
λ*ext: 650 nm
λ*V2: 460.1 nm
#b27554
L: 55.02
a: 20.68
b: 27.67
λ*ext: 650 nm
λ*V2: 459.9 nm
#b7724e
L: 55.03
a: 23.37
b: 31.6
λ*ext: 649 nm
λ*V2: 460.7 nm
#bc7047
L: 55.04
a: 26.08
b: 35.52
λ*ext: 649 nm
λ*V2: 461.1 nm
#c16e40
L: 55.04
a: 28.81
b: 39.44
λ*ext: 648 nm
λ*V2: 462 nm
#c56b38
L: 55.05
a: 31.54
b: 43.46
λ*ext: 648 nm
λ*V2: 462.3 nm
#ca6931
L: 55.06
a: 34.29
b: 47.38
λ*ext: 647 nm
λ*V2: 463.3 nm
#ce6628
L: 55.07
a: 37.04
b: 51.37
λ*ext: 645 nm
λ*V2: 465 nm
#d2641f
L: 55.08
a: 39.81
b: 55.32
λ*ext: 645 nm
λ*V2: 465.4 nm
#d66115
L: 55.1
a: 42.58
b: 59.29
λ*ext: 642 nm
λ*V2: 467.7 nm
#da5e04
L: 55.11
a: 45.37
b: 63.31
λ*ext: 641 nm
λ*V2: 469.1 nm
#de5a00
L: 55.12
a: 48.16
b: 67.32
λ*ext: 639 nm
λ*V2: 471.3 nm
#e25700
L: 55.13
a: 50.96
b: 71.29
λ*ext: 637 nm
λ*V2: 473.3 nm
#e65300
L: 55.15
a: 53.77
b: 75.33
λ*ext: 636 nm
λ*V2: 474.5 nm
#e94f00
L: 55.16
a: 56.59
b: 79.27
λ*ext: 633 nm
λ*V2: 477.2 nm
#ed4b00
L: 55.17
a: 59.41
b: 83.15
λ*ext: 630 nm
λ*V2: 480.4 nm
#a48b82
L: 60.01
a: 7.89
b: 8.11
λ*ext: 633 nm
λ*V2: 477 nm
#aa897b
L: 60.01
a: 10.46
b: 12.07
λ*ext: 632 nm
λ*V2: 478 nm
#b08775
L: 60.01
a: 13.06
b: 16.04
λ*ext: 632 nm
λ*V2: 477.8 nm
#b6856e
L: 60.01
a: 15.69
b: 19.99
λ*ext: 633 nm
λ*V2: 477.1 nm
#bc8367
L: 60.02
a: 18.34
b: 23.95
λ*ext: 633 nm
λ*V2: 476.9 nm
#c18160
L: 60.02
a: 21.01
b: 27.87
λ*ext: 632 nm
λ*V2: 478 nm
#c67f59
L: 60.03
a: 23.7
b: 31.85
λ*ext: 633 nm
λ*V2: 477.1 nm
#cb7d52
L: 60.03
a: 26.4
b: 35.79
λ*ext: 632 nm
λ*V2: 477.9 nm
#d07a4b
L: 60.04
a: 29.11
b: 39.75
λ*ext: 631 nm
λ*V2: 479.2 nm
#d57844
L: 60.05
a: 31.84
b: 43.71
λ*ext: 631 nm
λ*V2: 479.4 nm
#d9763c
L: 60.06
a: 34.57
b: 47.67
λ*ext: 629 nm
λ*V2: 481.1 nm
#de7334
L: 60.07
a: 37.32
b: 51.64
λ*ext: 628 nm
λ*V2: 481.6 nm
#e2702c
L: 60.08
a: 40.08
b: 55.59
λ*ext: 627 nm
λ*V2: 482.9 nm
#e66d23
L: 60.09
a: 42.85
b: 59.55
λ*ext: 626 nm
λ*V2: 484.3 nm
#ea6b18
L: 60.1
a: 45.63
b: 63.49
λ*ext: 624 nm
λ*V2: 486.5 nm
#ee6707
L: 60.11
a: 48.42
b: 67.46
λ*ext: 622 nm
λ*V2: 488.2 nm
#f26400
L: 60.13
a: 51.21
b: 71.45
λ*ext: 620 nm
λ*V2: 489.9 nm
#f66100
L: 60.14
a: 54
b: 75.56
λ*ext: 616 nm
λ*V2: 493.7 nm
#fa5d00
L: 60.15
a: 56.81
b: 79.53
λ*ext: 615 nm
λ*V2: 495.3 nm
#fe5900
L: 60.16
a: 59.63
b: 83.45
λ*ext: 612 nm
λ*V2: 498 nm
#ff5500
L: 60.18
a: 62.44
b: 87.49
λ*ext: 610 nm
λ*V2: 500.6 nm
#ff5100
L: 60.19
a: 65.27
b: 91.44
λ*ext: 604 nm
λ*V2: 506.1 nm
#b2988f
L: 65.01
a: 8.27
b: 8.31
λ*ext: 612 nm
λ*V2: 497.4 nm
#b99688
L: 65.01
a: 10.82
b: 12.31
λ*ext: 612 nm
λ*V2: 497.5 nm
#bf9481
L: 65.02
a: 13.44
b: 16.23
λ*ext: 611 nm
λ*V2: 498.4 nm
#c5927a
L: 65.01
a: 16.05
b: 20.22
λ*ext: 613 nm
λ*V2: 496.8 nm
#cb9073
L: 65.02
a: 18.69
b: 24.17
λ*ext: 613 nm
λ*V2: 496.8 nm
#d08e6c
L: 65.02
a: 21.36
b: 28.1
λ*ext: 613 nm
λ*V2: 497.3 nm
#d68c65
L: 65.03
a: 24.04
b: 32.02
λ*ext: 612 nm
λ*V2: 498 nm
#db895e
L: 65.03
a: 26.73
b: 36
λ*ext: 612 nm
λ*V2: 498.5 nm
#e08757
L: 65.04
a: 29.43
b: 39.97
λ*ext: 611 nm
λ*V2: 499 nm
#e58550
L: 65.05
a: 32.14
b: 43.94
λ*ext: 611 nm
λ*V2: 498.9 nm
#e98248
L: 65.06
a: 34.88
b: 47.83
λ*ext: 609 nm
λ*V2: 500.7 nm
#ee8040
L: 65.07
a: 37.61
b: 51.9
λ*ext: 609 nm
λ*V2: 500.6 nm
#f27d38
L: 65.08
a: 40.36
b: 55.83
λ*ext: 607 nm
λ*V2: 503.3 nm
#f77a30
L: 65.09
a: 43.12
b: 59.79
λ*ext: 606 nm
λ*V2: 504.6 nm
