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.


H025_L005_C005
#1a0d0c
L: 4.99
a: 5.63
b: 2.55
λ*ext: 727 nm
λ*V2: 382.4 nm
H025_L010_C005
#251817
L: 10
a: 6.17
b: 3.42
λ*ext: 725 nm
λ*V2: 384.4 nm
H025_L010_C010
#2a1514
L: 10.04
a: 10.51
b: 5.39
λ*ext: 725 nm
λ*V2: 384.9 nm
H025_L010_C015
#301211
L: 10.04
a: 14.97
b: 7.2
λ*ext: 724 nm
λ*V2: 385.6 nm
H025_L010_C020
#350e0e
L: 10.05
a: 19.38
b: 9.09
λ*ext: 723 nm
λ*V2: 386.1 nm
H025_L015_C005
#302220
L: 15.01
a: 6.51
b: 3.74
λ*ext: 722 nm
λ*V2: 387.6 nm
H025_L015_C010
#361f1e
L: 15.03
a: 10.89
b: 5.69
λ*ext: 721 nm
λ*V2: 388.2 nm
H025_L015_C015
#3c1c1b
L: 15.05
a: 15.26
b: 7.7
λ*ext: 721 nm
λ*V2: 388.3 nm
H025_L015_C020
#411918
L: 15.06
a: 19.66
b: 9.74
λ*ext: 721 nm
λ*V2: 388.8 nm
H025_L015_C025
#461416
L: 15.08
a: 24.11
b: 11.68
λ*ext: 719 nm
λ*V2: 390.5 nm
H025_L015_C030
#4b0f14
L: 15.08
a: 28.6
b: 13.5
λ*ext: 718 nm
λ*V2: 391.4 nm
H025_L020_C005
#3c2c2a
L: 20.01
a: 6.84
b: 4.04
λ*ext: 718 nm
λ*V2: 391.4 nm
H025_L020_C010
#422a27
L: 20.03
a: 11.18
b: 6.07
λ*ext: 717 nm
λ*V2: 392.2 nm
H025_L020_C015
#482725
L: 20.05
a: 15.57
b: 8.11
λ*ext: 717 nm
λ*V2: 392.6 nm
H025_L020_C020
#4e2322
L: 20.06
a: 20
b: 10.03
λ*ext: 716 nm
λ*V2: 393.4 nm
H025_L020_C025
#541f20
L: 20.08
a: 24.4
b: 11.99
λ*ext: 715 nm
λ*V2: 394.2 nm
H025_L020_C030
#591a1d
L: 20.09
a: 28.84
b: 13.97
λ*ext: 714 nm
λ*V2: 395.5 nm
H025_L020_C035
#5e141b
L: 20.09
a: 33.32
b: 15.86
λ*ext: 713 nm
λ*V2: 396.7 nm
H025_L020_C040
#630c18
L: 20.1
a: 37.79
b: 17.69
λ*ext: 711 nm
λ*V2: 398.7 nm
H025_L025_C005
#483735
L: 25.02
a: 7.2
b: 4.3
λ*ext: 712 nm
λ*V2: 397.1 nm
H025_L025_C010
#4f3432
L: 25.03
a: 11.55
b: 6.35
λ*ext: 712 nm
λ*V2: 397.2 nm
H025_L025_C015
#55312f
L: 25.05
a: 15.92
b: 8.33
λ*ext: 711 nm
λ*V2: 398.5 nm
H025_L025_C020
#5b2e2c
L: 25.06
a: 20.32
b: 10.33
λ*ext: 711 nm
λ*V2: 398.9 nm
H025_L025_C025
#612a2a
L: 25.08
a: 24.73
b: 12.28
λ*ext: 710 nm
λ*V2: 400 nm
H025_L025_C030
#662627
L: 25.09
a: 29.15
b: 14.26
λ*ext: 708 nm
λ*V2: 401.3 nm
H025_L025_C035
#6c2124
L: 25.11
a: 33.59
b: 16.19
λ*ext: 707 nm
λ*V2: 402.6 nm
H025_L025_C040
#711a22
L: 25.12
a: 38.03
b: 18.13
λ*ext: 705 nm
λ*V2: 404.7 nm
H025_L025_C045
#76121f
L: 25.12
a: 42.53
b: 19.95
λ*ext: 703 nm
λ*V2: 406.9 nm
H025_L025_C050
#7b031d
L: 25.13
a: 47.01
b: 21.74
λ*ext: 700 nm
λ*V2: 409.2 nm
H025_L030_C005
#54423f
L: 30.02
a: 7.52
b: 4.6
λ*ext: 706 nm
λ*V2: 403.4 nm
H025_L030_C010
#5b3f3c
L: 30.03
a: 11.87
b: 6.66
λ*ext: 706 nm
λ*V2: 403.8 nm
H025_L030_C015
#623c3a
L: 30.05
a: 16.26
b: 8.59
λ*ext: 704 nm
λ*V2: 405.4 nm
H025_L030_C020
#683937
L: 30.07
a: 20.68
b: 10.51
λ*ext: 702 nm
λ*V2: 407.5 nm
H025_L030_C025
#6f3534
L: 30.08
a: 25.07
b: 12.54
λ*ext: 702 nm
λ*V2: 407.7 nm
H025_L030_C030
#743131
L: 30.09
a: 29.46
b: 14.57
λ*ext: 701 nm
λ*V2: 408.7 nm
H025_L030_C035
#7a2d2f
L: 30.11
a: 33.89
b: 16.53
λ*ext: 700 nm
λ*V2: 410.1 nm
H025_L030_C040
#80272c
L: 30.12
a: 38.32
b: 18.49
λ*ext: 698 nm
λ*V2: 411.4 nm
H025_L030_C045
#852129
L: 30.14
a: 42.77
b: 20.41
λ*ext: 696 nm
λ*V2: 413.8 nm
H025_L030_C050
#8a1827
L: 30.14
a: 47.26
b: 22.24
λ*ext: 693 nm
λ*V2: 416.8 nm
H025_L030_C055
#900925
L: 30.14
a: 51.78
b: 23.92
λ*ext: 689 nm
λ*V2: 420.3 nm
H025_L030_C060
#950022
L: 30.15
a: 56.26
b: 25.66
λ*ext: 686 nm
λ*V2: 424.1 nm
H025_L035_C005
#614d4b
L: 35.02
a: 7.92
b: 4.78
λ*ext: 697 nm
λ*V2: 413 nm
H025_L035_C010
#694b47
L: 35.03
a: 12.23
b: 6.9
λ*ext: 697 nm
λ*V2: 412.4 nm
H025_L035_C015
#6f4844
L: 35.04
a: 16.59
b: 8.92
λ*ext: 696 nm
λ*V2: 413.2 nm
H025_L035_C020
#764442
L: 35.06
a: 20.98
b: 10.9
λ*ext: 695 nm
λ*V2: 414.4 nm
H025_L035_C025
#7c413f
L: 35.08
a: 25.38
b: 12.89
λ*ext: 694 nm
λ*V2: 415.8 nm
H025_L035_C030
#833d3c
L: 35.09
a: 29.78
b: 14.86
λ*ext: 692 nm
λ*V2: 417.2 nm
H025_L035_C035
#883939
L: 35.11
a: 34.2
b: 16.85
λ*ext: 691 nm
λ*V2: 418.2 nm
H025_L035_C040
#8e3436
L: 35.13
a: 38.62
b: 18.81
λ*ext: 689 nm
λ*V2: 420.7 nm
H025_L035_C045
#942e34
L: 35.14
a: 43.08
b: 20.71
λ*ext: 687 nm
λ*V2: 423.2 nm
H025_L035_C050
#9a2731
L: 35.15
a: 47.52
b: 22.66
λ*ext: 684 nm
λ*V2: 425.8 nm
H025_L035_C055
#9f1e2e
L: 35.16
a: 51.99
b: 24.49
λ*ext: 682 nm
λ*V2: 427.9 nm
H025_L035_C060
#a4112c
L: 35.16
a: 56.51
b: 26.2
λ*ext: 677 nm
λ*V2: 432.7 nm
H025_L035_C065
#aa002a
L: 35.17
a: 60.99
b: 28.01
λ*ext: 674 nm
λ*V2: 436.1 nm
H025_L040_C005
#6e5956
L: 40.02
a: 8.24
b: 5.13
λ*ext: 688 nm
λ*V2: 421.5 nm
H025_L040_C010
#765653
L: 40.04
a: 12.6
b: 7.07
λ*ext: 686 nm
λ*V2: 424.1 nm
H025_L040_C015
#7d5350
L: 40.05
a: 16.93
b: 9.19
λ*ext: 686 nm
λ*V2: 423.7 nm
H025_L040_C020
#84504d
L: 40.06
a: 21.33
b: 11.14
λ*ext: 684 nm
λ*V2: 425.3 nm
H025_L040_C025
#8a4d4a
L: 40.07
a: 25.72
b: 13.16
λ*ext: 684 nm
λ*V2: 425.6 nm
H025_L040_C030
#914947
L: 40.09
a: 30.13
b: 15.1
λ*ext: 681 nm
λ*V2: 428.3 nm
H025_L040_C035
#974544
L: 40.11
a: 34.54
b: 17.09
λ*ext: 680 nm
λ*V2: 429.9 nm
H025_L040_C040
#9d4041
L: 40.12
a: 38.96
b: 19.04
λ*ext: 678 nm
λ*V2: 431.8 nm
H025_L040_C045
#a33b3e
L: 40.14
a: 43.37
b: 21.05
λ*ext: 676 nm
λ*V2: 433.9 nm
H025_L040_C050
#a9353b
L: 40.15
a: 47.82
b: 22.95
λ*ext: 673 nm
λ*V2: 436.6 nm
H025_L040_C055
#af2d39
L: 40.17
a: 52.27
b: 24.89
λ*ext: 670 nm
λ*V2: 439.9 nm
H025_L040_C060
#b42436
L: 40.18
a: 56.73
b: 26.79
λ*ext: 667 nm
λ*V2: 443.1 nm
H025_L040_C065
#ba1734
L: 40.18
a: 61.24
b: 28.53
λ*ext: 662 nm
λ*V2: 448.1 nm
H025_L040_C070
#bf0031
L: 40.17
a: 65.77
b: 30.16
λ*ext: 657 nm
λ*V2: 453.1 nm
H025_L045_C005
#7c6561
L: 45.02
a: 8.6
b: 5.38
λ*ext: 676 nm
λ*V2: 433.3 nm
H025_L045_C010
#83625e
L: 45.03
a: 12.93
b: 7.43
λ*ext: 676 nm
λ*V2: 434 nm
H025_L045_C015
#8b5f5b
L: 45.05
a: 17.28
b: 9.46
λ*ext: 674 nm
λ*V2: 435.5 nm
H025_L045_C020
#925c58
L: 45.06
a: 21.69
b: 11.4
λ*ext: 673 nm
λ*V2: 436.8 nm
H025_L045_C025
#995855
L: 45.07
a: 26.07
b: 13.39
λ*ext: 671 nm
λ*V2: 438.5 nm
H025_L045_C030
#9f5552
L: 45.09
a: 30.47
b: 15.38
λ*ext: 669 nm
λ*V2: 440.6 nm
H025_L045_C035
#a6514f
L: 45.11
a: 34.87
b: 17.37
λ*ext: 668 nm
λ*V2: 441.9 nm
H025_L045_C040
#ac4c4c
L: 45.12
a: 39.28
b: 19.35
λ*ext: 666 nm
λ*V2: 444.2 nm
H025_L045_C045
#b24749
L: 45.14
a: 43.71
b: 21.3
λ*ext: 664 nm
λ*V2: 446.3 nm
H025_L045_C050
#b84246
L: 45.16
a: 48.14
b: 23.25
λ*ext: 660 nm
λ*V2: 449.5 nm
H025_L045_C055
#be3b44
L: 45.17
a: 52.57
b: 25.18
λ*ext: 657 nm
λ*V2: 452.7 nm
H025_L045_C060
#c43441
L: 45.18
a: 57.03
b: 27.04
λ*ext: 653 nm
λ*V2: 457.1 nm
H025_L045_C065
#ca2b3e
L: 45.19
a: 61.49
b: 28.96
λ*ext: 649 nm
λ*V2: 460.8 nm
H025_L045_C070
#cf1e3c
L: 45.2
a: 65.97
b: 30.79
λ*ext: 645 nm
λ*V2: 465 nm
H025_L045_C075
#d50839
L: 45.19
a: 70.48
b: 32.57
λ*ext: 638 nm
λ*V2: 471.8 nm
H025_L045_C080
#da0037
L: 45.19
a: 75.01
b: 34.15
λ*ext: 633 nm
λ*V2: 477.5 nm
H025_L050_C005
#89716d
L: 50.02
a: 8.95
b: 5.66
λ*ext: 663 nm
λ*V2: 446.4 nm
H025_L050_C010
#916e6a
L: 50.03
a: 13.3
b: 7.65
λ*ext: 661 nm
λ*V2: 448.3 nm
H025_L050_C015
#996b67
L: 50.05
a: 17.65
b: 9.68
λ*ext: 660 nm
λ*V2: 450 nm
H025_L050_C020
#a06864
L: 50.06
a: 22.02
b: 11.69
λ*ext: 659 nm
λ*V2: 450.5 nm
H025_L050_C025
#a76561
L: 50.07
a: 26.42
b: 13.63
λ*ext: 657 nm
λ*V2: 452.5 nm
H025_L050_C030
#ae615e
L: 50.09
a: 30.81
b: 15.64
λ*ext: 656 nm
λ*V2: 454.3 nm
H025_L050_C035
#b55d5b
L: 50.11
a: 35.22
b: 17.6
λ*ext: 653 nm
λ*V2: 456.5 nm
H025_L050_C040
#bb5958
L: 50.12
a: 39.62
b: 19.61
λ*ext: 651 nm
λ*V2: 458.6 nm
H025_L050_C045
#c25455
L: 50.14
a: 44.03
b: 21.57
λ*ext: 648 nm
λ*V2: 462 nm
H025_L050_C050
#c84f52
L: 50.16
a: 48.45
b: 23.53
λ*ext: 645 nm
λ*V2: 464.8 nm
H025_L050_C055
#ce494f
L: 50.17
a: 52.89
b: 25.48
λ*ext: 642 nm
λ*V2: 468.1 nm
H025_L050_C060
#d4424c
L: 50.18
a: 57.33
b: 27.41
λ*ext: 638 nm
λ*V2: 471.7 nm
H025_L050_C065
#da3b49
L: 50.2
a: 61.78
b: 29.29
λ*ext: 634 nm
λ*V2: 475.9 nm
H025_L050_C070
#e03146
L: 50.21
a: 66.23
b: 31.22
λ*ext: 629 nm
λ*V2: 480.9 nm
H025_L050_C075
#e52544
L: 50.21
a: 70.72
b: 33.03
λ*ext: 624 nm
λ*V2: 486.1 nm
H025_L050_C080
#eb1241
L: 50.21
a: 75.22
b: 34.79
λ*ext: 617 nm
λ*V2: 493 nm
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