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.
#903408
L: 35.1
a: 37.05
b: 43.46
λ*ext: 693 nm
λ*V2: 416.7 nm
#943000
L: 35.11
a: 40.17
b: 47.38
λ*ext: 692 nm
λ*V2: 418 nm
#6d5a53
L: 40.01
a: 6.85
b: 6.73
λ*ext: 688 nm
λ*V2: 421.7 nm
#73584d
L: 40.01
a: 9.76
b: 10.52
λ*ext: 689 nm
λ*V2: 421.1 nm
#795647
L: 40.02
a: 12.74
b: 14.25
λ*ext: 689 nm
λ*V2: 420.8 nm
#7f5341
L: 40.02
a: 15.77
b: 17.9
λ*ext: 689 nm
λ*V2: 421.1 nm
#84513c
L: 40.03
a: 18.79
b: 21.59
λ*ext: 689 nm
λ*V2: 421.2 nm
#894f36
L: 40.04
a: 21.84
b: 25.28
λ*ext: 688 nm
λ*V2: 421.3 nm
#8e4c30
L: 40.05
a: 24.91
b: 28.95
λ*ext: 688 nm
λ*V2: 422.1 nm
#924a29
L: 40.06
a: 27.99
b: 32.66
λ*ext: 687 nm
λ*V2: 423 nm
#974723
L: 40.07
a: 31.09
b: 36.33
λ*ext: 686 nm
λ*V2: 423.9 nm
#9b441c
L: 40.08
a: 34.21
b: 39.99
λ*ext: 685 nm
λ*V2: 424.6 nm
#a04015
L: 40.1
a: 37.31
b: 43.7
λ*ext: 683 nm
λ*V2: 426.3 nm
#a43d0b
L: 40.11
a: 40.43
b: 47.45
λ*ext: 681 nm
λ*V2: 428.6 nm
#a83901
L: 40.12
a: 43.58
b: 51.13
λ*ext: 681 nm
λ*V2: 429.2 nm
#ac3500
L: 40.14
a: 46.72
b: 54.95
λ*ext: 679 nm
λ*V2: 431.1 nm
#b03000
L: 40.15
a: 49.87
b: 58.49
λ*ext: 676 nm
λ*V2: 434.2 nm
#7a665f
L: 45.01
a: 7.16
b: 7.09
λ*ext: 678 nm
λ*V2: 431.7 nm
#816458
L: 45.01
a: 10.1
b: 10.82
λ*ext: 678 nm
λ*V2: 431.8 nm
#876253
L: 45.02
a: 13.08
b: 14.51
λ*ext: 677 nm
λ*V2: 432.5 nm
#8d5f4d
L: 45.02
a: 16.09
b: 18.19
λ*ext: 677 nm
λ*V2: 432.3 nm
#925d47
L: 45.03
a: 19.12
b: 21.87
λ*ext: 677 nm
λ*V2: 432.6 nm
#975b41
L: 45.03
a: 22.16
b: 25.56
λ*ext: 677 nm
λ*V2: 432.6 nm
#9c583b
L: 45.05
a: 25.23
b: 29.15
λ*ext: 675 nm
λ*V2: 434.9 nm
#a15634
L: 45.05
a: 28.29
b: 32.9
λ*ext: 676 nm
λ*V2: 434 nm
#a6532e
L: 45.07
a: 31.38
b: 36.59
λ*ext: 674 nm
λ*V2: 435.3 nm
#ab5027
L: 45.08
a: 34.48
b: 40.27
λ*ext: 674 nm
λ*V2: 436 nm
#af4d20
L: 45.09
a: 37.6
b: 43.89
λ*ext: 672 nm
λ*V2: 438.1 nm
#b34919
L: 45.1
a: 40.71
b: 47.65
λ*ext: 671 nm
λ*V2: 439.2 nm
#b7460f
L: 45.12
a: 43.83
b: 51.41
λ*ext: 669 nm
λ*V2: 441.1 nm
#bc4203
L: 45.13
a: 46.95
b: 55.17
λ*ext: 667 nm
λ*V2: 443.2 nm
#c03d00
L: 45.14
a: 50.1
b: 58.88
λ*ext: 665 nm
λ*V2: 444.9 nm
#c43900
L: 45.16
a: 53.25
b: 62.63
λ*ext: 662 nm
λ*V2: 447.8 nm
#c83300
L: 45.17
a: 56.43
b: 66.03
λ*ext: 659 nm
λ*V2: 450.5 nm
#88726a
L: 50.01
a: 7.54
b: 7.32
λ*ext: 665 nm
λ*V2: 445.1 nm
#8f7064
L: 50.01
a: 10.46
b: 11.06
λ*ext: 664 nm
λ*V2: 445.6 nm
#956e5e
L: 50.02
a: 13.43
b: 14.74
λ*ext: 664 nm
λ*V2: 446.1 nm
#9b6b58
L: 50.03
a: 16.45
b: 18.36
λ*ext: 663 nm
λ*V2: 447 nm
#a16952
L: 50.03
a: 19.45
b: 22.11
λ*ext: 664 nm
λ*V2: 446.1 nm
#a6674c
L: 50.04
a: 22.48
b: 25.81
λ*ext: 663 nm
λ*V2: 446.8 nm
#ab6446
L: 50.04
a: 25.54
b: 29.48
λ*ext: 663 nm
λ*V2: 446.7 nm
#b0623f
L: 50.05
a: 28.61
b: 33.15
λ*ext: 662 nm
λ*V2: 447.8 nm
#b55f39
L: 50.06
a: 31.68
b: 36.84
λ*ext: 662 nm
λ*V2: 448.3 nm
#ba5c32
L: 50.08
a: 34.76
b: 40.51
λ*ext: 659 nm
λ*V2: 450.4 nm
#be592c
L: 50.09
a: 37.87
b: 44.19
λ*ext: 659 nm
λ*V2: 451 nm
#c35624
L: 50.1
a: 40.97
b: 47.93
λ*ext: 657 nm
λ*V2: 453 nm
#c7521c
L: 50.11
a: 44.1
b: 51.6
λ*ext: 656 nm
λ*V2: 454.2 nm
#cc4f13
L: 50.13
a: 47.22
b: 55.34
λ*ext: 654 nm
λ*V2: 456.4 nm
#d04b06
L: 50.14
a: 50.35
b: 59.03
λ*ext: 651 nm
λ*V2: 459 nm
#d44600
L: 50.15
a: 53.5
b: 62.78
λ*ext: 649 nm
λ*V2: 461 nm
#d84100
L: 50.17
a: 56.65
b: 66.41
λ*ext: 646 nm
λ*V2: 464.1 nm
#dc3c00
L: 50.18
a: 59.8
b: 70.24
λ*ext: 643 nm
λ*V2: 467.3 nm
#e03600
L: 50.18
a: 62.98
b: 73.83
λ*ext: 639 nm
λ*V2: 471 nm
#967e76
L: 55.01
a: 7.89
b: 7.59
λ*ext: 649 nm
λ*V2: 460.5 nm
#9d7c70
L: 55.02
a: 10.84
b: 11.23
λ*ext: 647 nm
λ*V2: 462.6 nm
#a37a6a
L: 55.02
a: 13.78
b: 15.01
λ*ext: 649 nm
λ*V2: 461.1 nm
#a97864
L: 55.02
a: 16.78
b: 18.68
λ*ext: 649 nm
λ*V2: 461 nm
#af765e
L: 55.03
a: 19.79
b: 22.36
λ*ext: 648 nm
λ*V2: 461.9 nm
#b57357
L: 55.03
a: 22.82
b: 26.04
λ*ext: 648 nm
λ*V2: 461.7 nm
#ba7151
L: 55.04
a: 25.86
b: 29.72
λ*ext: 647 nm
λ*V2: 462.7 nm
#bf6e4b
L: 55.05
a: 28.91
b: 33.41
λ*ext: 647 nm
λ*V2: 463.4 nm
#c46b44
L: 55.06
a: 31.99
b: 37.08
λ*ext: 645 nm
λ*V2: 464.8 nm
#c9693e
L: 55.07
a: 35.07
b: 40.74
λ*ext: 644 nm
λ*V2: 466 nm
#ce6637
L: 55.08
a: 38.17
b: 44.36
λ*ext: 642 nm
λ*V2: 468.3 nm
#d36230
L: 55.09
a: 41.26
b: 48.12
λ*ext: 641 nm
λ*V2: 468.7 nm
#d75f29
L: 55.11
a: 44.37
b: 51.85
λ*ext: 641 nm
λ*V2: 469.2 nm
#dc5c21
L: 55.12
a: 47.49
b: 55.46
λ*ext: 637 nm
λ*V2: 472.6 nm
#e05817
L: 55.14
a: 50.61
b: 59.29
λ*ext: 636 nm
λ*V2: 474.2 nm
#e5540b
L: 55.15
a: 53.74
b: 62.96
λ*ext: 632 nm
λ*V2: 477.7 nm
#e94f00
L: 55.16
a: 56.89
b: 66.63
λ*ext: 630 nm
λ*V2: 479.6 nm
#ed4b00
L: 55.17
a: 60.03
b: 70.49
λ*ext: 627 nm
λ*V2: 483.5 nm
#f14500
L: 55.19
a: 63.19
b: 74.08
λ*ext: 624 nm
λ*V2: 486 nm
#f53f00
L: 55.19
a: 66.36
b: 77.85
λ*ext: 620 nm
λ*V2: 490.3 nm
#f93900
L: 55.2
a: 69.53
b: 81.55
λ*ext: 614 nm
λ*V2: 495.9 nm
#a48b83
L: 60.01
a: 8.25
b: 7.85
λ*ext: 632 nm
λ*V2: 478 nm
#ab897c
L: 60.02
a: 11.17
b: 11.55
λ*ext: 631 nm
λ*V2: 478.5 nm
#b28776
L: 60.02
a: 14.14
b: 15.24
λ*ext: 631 nm
λ*V2: 479 nm
#b88470
L: 60.02
a: 17.13
b: 18.93
λ*ext: 631 nm
λ*V2: 478.8 nm
#be8269
L: 60.03
a: 20.14
b: 22.61
λ*ext: 631 nm
λ*V2: 478.6 nm
#c48063
L: 60.03
a: 23.16
b: 26.28
λ*ext: 630 nm
λ*V2: 479.9 nm
#c97d5d
L: 60.04
a: 26.19
b: 29.98
λ*ext: 630 nm
λ*V2: 480.2 nm
#cf7b56
L: 60.05
a: 29.24
b: 33.63
λ*ext: 629 nm
λ*V2: 481.3 nm
#d47850
L: 60.06
a: 32.3
b: 37.34
λ*ext: 628 nm
λ*V2: 482.3 nm
#d97549
L: 60.07
a: 35.38
b: 41.02
λ*ext: 627 nm
λ*V2: 482.8 nm
#de7243
L: 60.08
a: 38.45
b: 44.72
λ*ext: 626 nm
λ*V2: 484.4 nm
#e36f3c
L: 60.09
a: 41.55
b: 48.36
λ*ext: 623 nm
λ*V2: 487.2 nm
#e86c34
L: 60.1
a: 44.64
b: 52.12
λ*ext: 622 nm
λ*V2: 487.9 nm
#ec682d
L: 60.12
a: 47.77
b: 55.74
λ*ext: 621 nm
λ*V2: 489.5 nm
#f16525
L: 60.13
a: 50.88
b: 59.47
λ*ext: 619 nm
λ*V2: 491.3 nm
#f5611b
L: 60.14
a: 54
b: 63.2
λ*ext: 616 nm
λ*V2: 494.6 nm
#fa5d0f
L: 60.16
a: 57.12
b: 66.97
λ*ext: 612 nm
λ*V2: 498.5 nm
#fe5900
L: 60.17
a: 60.27
b: 70.64
λ*ext: 609 nm
λ*V2: 501.2 nm
#ff5400
L: 60.18
a: 63.41
b: 74.41
λ*ext: 605 nm
λ*V2: 505.1 nm
#ff4f00
L: 60.19
a: 66.57
b: 78.11
λ*ext: 601 nm
λ*V2: 508.8 nm
#ff4900
L: 60.2
a: 69.74
b: 81.76
λ*ext: 599 nm
λ*V2: 511.5 nm
#b2988f
L: 65.01
a: 8.62
b: 8.09
λ*ext: 613 nm
λ*V2: 496.9 nm
#ba9589
L: 65.02
a: 11.56
b: 11.75
λ*ext: 610 nm
λ*V2: 499.9 nm
#c09382
L: 65.02
a: 14.5
b: 15.5
λ*ext: 612 nm
λ*V2: 498.4 nm
#c7917c
L: 65.02
a: 17.48
b: 19.17
λ*ext: 612 nm
λ*V2: 498.4 nm
#cd8f76
L: 65.03
a: 20.49
b: 22.81
λ*ext: 610 nm
λ*V2: 500 nm
