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.
#fb7826
L: 65.1
a: 45.89
b: 63.78
λ*ext: 604 nm
λ*V2: 506 nm
#ff751b
L: 65.11
a: 48.67
b: 67.68
λ*ext: 603 nm
λ*V2: 507.5 nm
#ff710a
L: 65.12
a: 51.45
b: 71.7
λ*ext: 600 nm
λ*V2: 509.8 nm
#ff6e00
L: 65.13
a: 54.25
b: 75.7
λ*ext: 597 nm
λ*V2: 513.4 nm
#ff6b00
L: 65.14
a: 57.04
b: 79.75
λ*ext: 595 nm
λ*V2: 515.2 nm
#ff6700
L: 65.15
a: 59.85
b: 83.77
λ*ext: 592 nm
λ*V2: 518.2 nm
#ff6300
L: 65.17
a: 62.67
b: 87.61
λ*ext: 591 nm
λ*V2: 519.3 nm
#c1a59c
L: 70.01
a: 8.65
b: 8.54
λ*ext: 590 nm
λ*V2: 520.1 nm
#c7a395
L: 70.01
a: 11.21
b: 12.5
λ*ext: 589 nm
λ*V2: 520.6 nm
#cea18e
L: 70.02
a: 13.81
b: 16.45
λ*ext: 590 nm
λ*V2: 520.3 nm
#d49f87
L: 70.02
a: 16.42
b: 20.41
λ*ext: 590 nm
λ*V2: 519.6 nm
#da9d7f
L: 70.02
a: 19.05
b: 24.38
λ*ext: 591 nm
λ*V2: 519.5 nm
#e09b78
L: 70.02
a: 21.7
b: 28.34
λ*ext: 591 nm
λ*V2: 518.6 nm
#e59971
L: 70.03
a: 24.37
b: 32.31
λ*ext: 591 nm
λ*V2: 519 nm
#ea966a
L: 70.03
a: 27.05
b: 36.27
λ*ext: 591 nm
λ*V2: 518.9 nm
#ef9463
L: 70.04
a: 29.74
b: 40.25
λ*ext: 590 nm
λ*V2: 519.7 nm
#f4925c
L: 70.05
a: 32.46
b: 44.11
λ*ext: 588 nm
λ*V2: 522.5 nm
#f98f54
L: 70.05
a: 35.17
b: 48.15
λ*ext: 588 nm
λ*V2: 522 nm
#fe8d4c
L: 70.06
a: 37.9
b: 52.17
λ*ext: 587 nm
λ*V2: 523.3 nm
#ff8a44
L: 70.07
a: 40.65
b: 56.08
λ*ext: 586 nm
λ*V2: 524.2 nm
#ff873c
L: 70.08
a: 43.39
b: 60.07
λ*ext: 583 nm
λ*V2: 527.1 nm
#ff8533
L: 70.09
a: 46.16
b: 64.01
λ*ext: 582 nm
λ*V2: 527.9 nm
#ff8229
L: 70.1
a: 48.93
b: 67.99
λ*ext: 581 nm
λ*V2: 529.6 nm
#ff7f1d
L: 70.11
a: 51.7
b: 72
λ*ext: 578 nm
λ*V2: 531.8 nm
#cfb2a9
L: 75.01
a: 9.04
b: 8.72
λ*ext: 564 nm
λ*V2: 546 nm
#d6b0a1
L: 75.01
a: 11.61
b: 12.68
λ*ext: 563 nm
λ*V2: 546.5 nm
#ddae9a
L: 75.01
a: 14.19
b: 16.64
λ*ext: 564 nm
λ*V2: 545.6 nm
#e3ac93
L: 75.01
a: 16.78
b: 20.65
λ*ext: 566 nm
λ*V2: 544.4 nm
#e9aa8c
L: 75.02
a: 19.4
b: 24.65
λ*ext: 567 nm
λ*V2: 543.2 nm
#efa885
L: 75.02
a: 22.07
b: 28.51
λ*ext: 565 nm
λ*V2: 545.4 nm
#f5a67e
L: 75.03
a: 24.71
b: 32.51
λ*ext: 566 nm
λ*V2: 544.4 nm
#faa476
L: 75.03
a: 27.39
b: 36.47
λ*ext: 564 nm
λ*V2: 545.8 nm
#ffa16f
L: 75.04
a: 30.07
b: 40.46
λ*ext: 565 nm
λ*V2: 545.4 nm
#ff9f68
L: 75.04
a: 32.77
b: 44.41
λ*ext: 564 nm
λ*V2: 546.1 nm
#ff9c60
L: 75.05
a: 35.48
b: 48.42
λ*ext: 563 nm
λ*V2: 547.3 nm
#ff9a59
L: 75.06
a: 38.21
b: 52.35
λ*ext: 562 nm
λ*V2: 547.5 nm
#ff9751
L: 75.07
a: 40.93
b: 56.38
λ*ext: 561 nm
λ*V2: 549.5 nm
#ff9548
L: 75.08
a: 43.68
b: 60.32
λ*ext: 561 nm
λ*V2: 548.9 nm
#debfb6
L: 80.01
a: 9.43
b: 8.93
λ*ext: 536 nm
λ*V2: 574.4 nm
#e5beae
L: 80.01
a: 11.96
b: 12.94
λ*ext: 536 nm
λ*V2: 573.8 nm
#ecbca7
L: 80.01
a: 14.55
b: 16.89
λ*ext: 537 nm
λ*V2: 573.3 nm
#f2baa0
L: 80.02
a: 17.13
b: 20.9
λ*ext: 538 nm
λ*V2: 571.9 nm
#f9b799
L: 80.02
a: 19.76
b: 24.84
λ*ext: 538 nm
λ*V2: 572.2 nm
#ffb592
L: 80.02
a: 22.42
b: 28.72
λ*ext: 535 nm
λ*V2: 574.5 nm
#ffb38a
L: 80.03
a: 25.06
b: 32.76
λ*ext: 538 nm
λ*V2: 571.8 nm
#ffb183
L: 80.03
a: 27.72
b: 36.72
λ*ext: 537 nm
λ*V2: 573 nm
#ffaf7b
L: 80.04
a: 30.39
b: 40.73
λ*ext: 537 nm
λ*V2: 572.4 nm
#ffac74
L: 80.04
a: 33.09
b: 44.68
λ*ext: 537 nm
λ*V2: 573 nm
#ffaa6d
L: 80.05
a: 35.8
b: 48.59
λ*ext: 538 nm
λ*V2: 572.2 nm
#edcdc3
L: 85.01
a: 9.78
b: 9.22
λ*ext: 506 nm
λ*V2: 603.7 nm
#f5cbbc
L: 85.01
a: 12.33
b: 13.17
λ*ext: 506 nm
λ*V2: 604.5 nm
#fbc9b4
L: 85.02
a: 14.94
b: 17.08
λ*ext: 504 nm
λ*V2: 606.2 nm
#ffc7ad
L: 85.02
a: 17.51
b: 21.1
λ*ext: 506 nm
λ*V2: 603.9 nm
#ffc5a6
L: 85.02
a: 20.12
b: 25.07
λ*ext: 506 nm
λ*V2: 604.2 nm
#ffc39e
L: 85.02
a: 22.76
b: 29.01
λ*ext: 507 nm
λ*V2: 603.4 nm
#ffc197
L: 85.03
a: 25.4
b: 32.99
λ*ext: 509 nm
λ*V2: 601 nm
#fddbd0
L: 90.01
a: 10.17
b: 9.41
λ*ext: 471 nm
λ*V2: 638.9 nm
#ffd9c9
L: 90.01
a: 12.72
b: 13.37
λ*ext: 471 nm
λ*V2: 638.8 nm
#ffd7c2
L: 90.01
a: 15.28
b: 17.36
λ*ext: 473 nm
λ*V2: 637.3 nm
#231914
L: 9.99
a: 4.1
b: 5.44
λ*ext: 725 nm
λ*V2: 384.3 nm
#27180d
L: 10.01
a: 6.29
b: 9.35
λ*ext: 725 nm
λ*V2: 384.5 nm
#2e231d
L: 15.01
a: 4.37
b: 5.85
λ*ext: 722 nm
λ*V2: 387.8 nm
#332118
L: 15
a: 6.68
b: 9.93
λ*ext: 722 nm
λ*V2: 387.3 nm
#362011
L: 15.01
a: 8.93
b: 14.16
λ*ext: 722 nm
λ*V2: 387.1 nm
#3a2d27
L: 20
a: 4.71
b: 6.16
λ*ext: 719 nm
λ*V2: 391 nm
#3f2c21
L: 20.01
a: 6.97
b: 10.35
λ*ext: 719 nm
λ*V2: 390.9 nm
#432a1b
L: 20.01
a: 9.26
b: 14.51
λ*ext: 719 nm
λ*V2: 391 nm
#462915
L: 20.01
a: 11.58
b: 18.67
λ*ext: 719 nm
λ*V2: 390.9 nm
#463831
L: 25.01
a: 5.04
b: 6.47
λ*ext: 713 nm
λ*V2: 396.1 nm
#4b362b
L: 25
a: 7.28
b: 10.66
λ*ext: 713 nm
λ*V2: 396.1 nm
#4f3525
L: 25
a: 9.55
b: 14.85
λ*ext: 714 nm
λ*V2: 395.8 nm
#53331e
L: 25.01
a: 11.88
b: 19.02
λ*ext: 714 nm
λ*V2: 395.9 nm
#573218
L: 25.01
a: 14.24
b: 23.18
λ*ext: 714 nm
λ*V2: 395.9 nm
#5b3011
L: 25.02
a: 16.59
b: 27.44
λ*ext: 714 nm
λ*V2: 396.1 nm
#52433c
L: 30
a: 5.39
b: 6.76
λ*ext: 707 nm
λ*V2: 402.4 nm
#574236
L: 30.01
a: 7.61
b: 10.95
λ*ext: 707 nm
λ*V2: 402.6 nm
#5c402f
L: 30.01
a: 9.88
b: 15.15
λ*ext: 707 nm
λ*V2: 402.3 nm
#603e29
L: 30.01
a: 12.18
b: 19.34
λ*ext: 708 nm
λ*V2: 402 nm
#643d22
L: 30.01
a: 14.52
b: 23.5
λ*ext: 707 nm
λ*V2: 402.1 nm
#683b1b
L: 30.02
a: 16.87
b: 27.7
λ*ext: 707 nm
λ*V2: 402.4 nm
#6c3914
L: 30.02
a: 19.25
b: 31.89
λ*ext: 707 nm
λ*V2: 402.6 nm
#6f370b
L: 30.03
a: 21.67
b: 36.06
λ*ext: 707 nm
λ*V2: 402.6 nm
#5f4e47
L: 35.01
a: 5.73
b: 7.02
λ*ext: 699 nm
λ*V2: 410.7 nm
#644d40
L: 35.01
a: 7.94
b: 11.28
λ*ext: 700 nm
λ*V2: 409.7 nm
#694b3a
L: 35.01
a: 10.21
b: 15.43
λ*ext: 700 nm
λ*V2: 410 nm
#6e4a33
L: 35.01
a: 12.5
b: 19.63
λ*ext: 700 nm
λ*V2: 409.8 nm
#72482c
L: 35.01
a: 14.82
b: 23.79
λ*ext: 699 nm
λ*V2: 410.2 nm
#764625
L: 35.02
a: 17.18
b: 27.99
λ*ext: 700 nm
λ*V2: 409.9 nm
#7a441e
L: 35.02
a: 19.54
b: 32.16
λ*ext: 699 nm
λ*V2: 410.4 nm
#7d4316
L: 35.03
a: 21.91
b: 36.41
λ*ext: 699 nm
λ*V2: 410.4 nm
#81410d
L: 35.04
a: 24.31
b: 40.6
λ*ext: 699 nm
λ*V2: 410.9 nm
#843e01
L: 35.05
a: 26.72
b: 44.81
λ*ext: 698 nm
λ*V2: 411.8 nm
#6c5a52
L: 40
a: 6.09
b: 7.29
λ*ext: 689 nm
λ*V2: 420.4 nm
#72584b
L: 40.01
a: 8.29
b: 11.52
λ*ext: 690 nm
λ*V2: 419.9 nm
#775745
L: 40
a: 10.53
b: 15.74
λ*ext: 690 nm
λ*V2: 419.3 nm
#7b553e
L: 40.01
a: 12.83
b: 19.89
λ*ext: 690 nm
λ*V2: 419.6 nm
#805437
L: 40.01
a: 15.14
b: 24.06
λ*ext: 690 nm
λ*V2: 419.3 nm
#845230
L: 40.01
a: 17.47
b: 28.29
λ*ext: 690 nm
λ*V2: 419.4 nm
#885029
L: 40.02
a: 19.82
b: 32.48
λ*ext: 690 nm
λ*V2: 419.5 nm
#8c4e21
L: 40.02
a: 22.19
b: 36.68
λ*ext: 690 nm
λ*V2: 419.7 nm
