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.
#8f5f39
L: 45
a: 15.42
b: 29.78
λ*ext: 680 nm
λ*V2: 429.2 nm
#935e31
L: 45
a: 17.37
b: 34.18
λ*ext: 681 nm
λ*V2: 429 nm
#975c29
L: 45.01
a: 19.34
b: 38.58
λ*ext: 681 nm
λ*V2: 429 nm
#9a5b20
L: 45.01
a: 21.34
b: 42.98
λ*ext: 680 nm
λ*V2: 429.4 nm
#9d5915
L: 45.02
a: 23.34
b: 47.42
λ*ext: 680 nm
λ*V2: 430.1 nm
#a15707
L: 45.02
a: 25.37
b: 51.81
λ*ext: 679 nm
λ*V2: 430.4 nm
#a45600
L: 45.03
a: 27.4
b: 56.24
λ*ext: 678 nm
λ*V2: 431.3 nm
#a75400
L: 45.04
a: 29.45
b: 60.71
λ*ext: 678 nm
λ*V2: 431.9 nm
#877269
L: 50
a: 6.39
b: 8.03
λ*ext: 665 nm
λ*V2: 444.5 nm
#8c7162
L: 50
a: 8.18
b: 12.47
λ*ext: 666 nm
λ*V2: 443.8 nm
#91705a
L: 50
a: 10.02
b: 16.89
λ*ext: 667 nm
λ*V2: 443 nm
#956e53
L: 50
a: 11.9
b: 21.24
λ*ext: 667 nm
λ*V2: 443.1 nm
#9a6d4b
L: 50
a: 13.8
b: 25.64
λ*ext: 667 nm
λ*V2: 442.5 nm
#9e6b44
L: 50
a: 15.73
b: 30.03
λ*ext: 668 nm
λ*V2: 441.9 nm
#a26a3c
L: 50
a: 17.67
b: 34.43
λ*ext: 668 nm
λ*V2: 441.9 nm
#a66834
L: 50.01
a: 19.63
b: 38.84
λ*ext: 668 nm
λ*V2: 441.7 nm
#a9672c
L: 50.01
a: 21.62
b: 43.18
λ*ext: 666 nm
λ*V2: 443.4 nm
#ad6522
L: 50.01
a: 23.61
b: 47.64
λ*ext: 668 nm
λ*V2: 442.1 nm
#b06317
L: 50.02
a: 25.61
b: 52.08
λ*ext: 667 nm
λ*V2: 442.8 nm
#b36207
L: 50.03
a: 27.64
b: 56.48
λ*ext: 667 nm
λ*V2: 443.2 nm
#b66000
L: 50.03
a: 29.68
b: 60.95
λ*ext: 666 nm
λ*V2: 443.6 nm
#b95e00
L: 50.04
a: 31.72
b: 65.38
λ*ext: 665 nm
λ*V2: 444.4 nm
#bc5c00
L: 50.05
a: 33.78
b: 69.8
λ*ext: 664 nm
λ*V2: 445.8 nm
#957f75
L: 55
a: 6.76
b: 8.28
λ*ext: 650 nm
λ*V2: 459.5 nm
#9a7d6e
L: 55
a: 8.54
b: 12.71
λ*ext: 650 nm
λ*V2: 459.6 nm
#9f7c66
L: 55
a: 10.38
b: 17.1
λ*ext: 651 nm
λ*V2: 458.8 nm
#a47b5f
L: 55
a: 12.24
b: 21.53
λ*ext: 653 nm
λ*V2: 456.8 nm
#a87957
L: 55
a: 14.14
b: 25.88
λ*ext: 652 nm
λ*V2: 457.8 nm
#ac784f
L: 55
a: 16.05
b: 30.28
λ*ext: 653 nm
λ*V2: 457.1 nm
#b17647
L: 55
a: 17.99
b: 34.68
λ*ext: 653 nm
λ*V2: 456.9 nm
#b4753f
L: 55
a: 19.93
b: 39.09
λ*ext: 653 nm
λ*V2: 456.6 nm
#b87337
L: 55.01
a: 21.91
b: 43.45
λ*ext: 653 nm
λ*V2: 457.2 nm
#bc712e
L: 55.01
a: 23.89
b: 47.88
λ*ext: 653 nm
λ*V2: 457.3 nm
#bf7024
L: 55.02
a: 25.89
b: 52.3
λ*ext: 653 nm
λ*V2: 457.3 nm
#c36e18
L: 55.03
a: 27.88
b: 56.81
λ*ext: 652 nm
λ*V2: 457.5 nm
#c66c07
L: 55.03
a: 29.92
b: 61.16
λ*ext: 652 nm
λ*V2: 458.4 nm
#c96a00
L: 55.04
a: 31.96
b: 65.61
λ*ext: 651 nm
λ*V2: 458.5 nm
#cc6900
L: 55.05
a: 34
b: 70.08
λ*ext: 650 nm
λ*V2: 459.7 nm
#cf6700
L: 55.05
a: 36.06
b: 74.56
λ*ext: 649 nm
λ*V2: 461.2 nm
#a38b81
L: 60
a: 7.12
b: 8.51
λ*ext: 633 nm
λ*V2: 477 nm
#a88a7a
L: 60
a: 8.91
b: 12.95
λ*ext: 633 nm
λ*V2: 476.9 nm
#ad8972
L: 60
a: 10.74
b: 17.35
λ*ext: 634 nm
λ*V2: 475.4 nm
#b2876b
L: 60
a: 12.59
b: 21.73
λ*ext: 635 nm
λ*V2: 475.2 nm
#b78663
L: 60
a: 14.49
b: 26.08
λ*ext: 635 nm
λ*V2: 475.2 nm
#bb845b
L: 60
a: 16.39
b: 30.49
λ*ext: 635 nm
λ*V2: 474.6 nm
#bf8353
L: 60
a: 18.3
b: 34.94
λ*ext: 637 nm
λ*V2: 472.9 nm
#c4814b
L: 60
a: 20.24
b: 39.35
λ*ext: 637 nm
λ*V2: 473.1 nm
#c78043
L: 60.01
a: 22.2
b: 43.74
λ*ext: 636 nm
λ*V2: 473.6 nm
#cb7e3a
L: 60.01
a: 24.18
b: 48.11
λ*ext: 636 nm
λ*V2: 473.5 nm
#cf7c31
L: 60.02
a: 26.16
b: 52.58
λ*ext: 636 nm
λ*V2: 473.6 nm
#d27b26
L: 60.02
a: 28.16
b: 57.01
λ*ext: 636 nm
λ*V2: 474.2 nm
#d6791a
L: 60.03
a: 30.18
b: 61.4
λ*ext: 635 nm
λ*V2: 474.8 nm
#d97707
L: 60.03
a: 32.2
b: 65.87
λ*ext: 635 nm
λ*V2: 475 nm
#dc7500
L: 60.04
a: 34.23
b: 70.31
λ*ext: 634 nm
λ*V2: 476.3 nm
#df7300
L: 60.05
a: 36.28
b: 74.77
λ*ext: 633 nm
λ*V2: 477 nm
#e27100
L: 60.06
a: 38.34
b: 79.21
λ*ext: 632 nm
λ*V2: 477.7 nm
#e56f00
L: 60.07
a: 40.4
b: 83.72
λ*ext: 630 nm
λ*V2: 479.6 nm
#b1988e
L: 65
a: 7.48
b: 8.77
λ*ext: 614 nm
λ*V2: 496.2 nm
#b79786
L: 65
a: 9.26
b: 13.22
λ*ext: 615 nm
λ*V2: 494.9 nm
#bc957f
L: 65
a: 11.1
b: 17.57
λ*ext: 614 nm
λ*V2: 495.7 nm
#c19477
L: 65
a: 12.95
b: 21.96
λ*ext: 615 nm
λ*V2: 494.5 nm
#c6926f
L: 65
a: 14.83
b: 26.35
λ*ext: 616 nm
λ*V2: 493.8 nm
#ca9167
L: 65
a: 16.72
b: 30.74
λ*ext: 617 nm
λ*V2: 493.3 nm
#cf8f5f
L: 65
a: 18.62
b: 35.18
λ*ext: 617 nm
λ*V2: 492.5 nm
#d38e57
L: 65
a: 20.56
b: 39.54
λ*ext: 617 nm
λ*V2: 492.9 nm
#d78c4f
L: 65.01
a: 22.51
b: 43.93
λ*ext: 617 nm
λ*V2: 493.1 nm
#db8b46
L: 65.01
a: 24.47
b: 48.39
λ*ext: 618 nm
λ*V2: 491.9 nm
#df893d
L: 65.01
a: 26.44
b: 52.82
λ*ext: 618 nm
λ*V2: 491.9 nm
#e28733
L: 65.02
a: 28.44
b: 57.14
λ*ext: 616 nm
λ*V2: 493.9 nm
#e68628
L: 65.03
a: 30.44
b: 61.63
λ*ext: 616 nm
λ*V2: 494 nm
#e9841b
L: 65.03
a: 32.45
b: 66.08
λ*ext: 616 nm
λ*V2: 493.8 nm
#ec8207
L: 65.04
a: 34.49
b: 70.46
λ*ext: 616 nm
λ*V2: 493.6 nm
#f08000
L: 65.05
a: 36.51
b: 74.96
λ*ext: 615 nm
λ*V2: 494.8 nm
#f37e00
L: 65.05
a: 38.56
b: 79.46
λ*ext: 614 nm
λ*V2: 496 nm
#f67c00
L: 65.06
a: 40.61
b: 83.93
λ*ext: 612 nm
λ*V2: 498.6 nm
#f97a00
L: 65.07
a: 42.67
b: 88.36
λ*ext: 612 nm
λ*V2: 498.6 nm
#fc7800
L: 65.08
a: 44.74
b: 92.81
λ*ext: 609 nm
λ*V2: 501.2 nm
#bfa59b
L: 70
a: 7.87
b: 8.98
λ*ext: 591 nm
λ*V2: 518.9 nm
#c5a493
L: 70
a: 9.65
b: 13.39
λ*ext: 592 nm
λ*V2: 518.3 nm
#cba28b
L: 70
a: 11.48
b: 17.76
λ*ext: 592 nm
λ*V2: 518 nm
#d0a183
L: 70
a: 13.32
b: 22.15
λ*ext: 593 nm
λ*V2: 517 nm
#d59f7b
L: 70
a: 15.18
b: 26.57
λ*ext: 595 nm
λ*V2: 515.3 nm
#d99e73
L: 70
a: 17.08
b: 30.92
λ*ext: 594 nm
λ*V2: 515.6 nm
#de9c6b
L: 70
a: 18.96
b: 35.39
λ*ext: 596 nm
λ*V2: 514 nm
#e29b63
L: 70
a: 20.89
b: 39.77
λ*ext: 596 nm
λ*V2: 514.1 nm
#e6995b
L: 70
a: 22.82
b: 44.21
λ*ext: 597 nm
λ*V2: 513.1 nm
#ea9852
L: 70.01
a: 24.77
b: 48.64
λ*ext: 598 nm
λ*V2: 512.6 nm
#ee9649
L: 70.01
a: 26.74
b: 53.03
λ*ext: 596 nm
λ*V2: 513.8 nm
#f29440
L: 70.02
a: 28.72
b: 57.44
λ*ext: 596 nm
λ*V2: 513.7 nm
#f69336
L: 70.02
a: 30.71
b: 61.88
λ*ext: 596 nm
λ*V2: 514 nm
#f9912a
L: 70.03
a: 32.72
b: 66.33
λ*ext: 595 nm
λ*V2: 514.8 nm
#fd8f1d
L: 70.03
a: 34.73
b: 70.71
λ*ext: 595 nm
λ*V2: 515.2 nm
#ff8d05
L: 70.04
a: 36.75
b: 75.21
λ*ext: 594 nm
λ*V2: 516.4 nm
#ff8b00
L: 70.05
a: 38.8
b: 79.6
λ*ext: 592 nm
λ*V2: 518.3 nm
#ff8900
L: 70.06
a: 40.84
b: 84.09
λ*ext: 593 nm
λ*V2: 517.6 nm
#ff8700
L: 70.06
a: 42.89
b: 88.54
λ*ext: 590 nm
λ*V2: 519.7 nm
#ff8500
L: 70.07
a: 44.95
b: 93.09
λ*ext: 589 nm
λ*V2: 521.4 nm
#ff8300
L: 70.08
a: 47.03
b: 97.53
λ*ext: 588 nm
λ*V2: 522.4 nm
#ceb2a8
L: 75
a: 8.25
b: 9.19
λ*ext: 566 nm
λ*V2: 544.1 nm
#d4b1a0
L: 75.01
a: 10.03
b: 13.58
λ*ext: 566 nm
λ*V2: 544.1 nm
