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.
#b3464f
L: 45.15
a: 45.36
b: 17.69
λ*ext: 660 nm
λ*V2: 449.4 nm
#ba404d
L: 45.17
a: 49.96
b: 19.26
λ*ext: 657 nm
λ*V2: 452.4 nm
#c0394b
L: 45.18
a: 54.58
b: 20.75
λ*ext: 654 nm
λ*V2: 456 nm
#c63049
L: 45.19
a: 59.22
b: 22.27
λ*ext: 651 nm
λ*V2: 459.2 nm
#cc2647
L: 45.2
a: 63.85
b: 23.76
λ*ext: 647 nm
λ*V2: 463.5 nm
#d11545
L: 45.2
a: 68.54
b: 25.09
λ*ext: 640 nm
λ*V2: 469.9 nm
#d70044
L: 45.19
a: 73.26
b: 26.26
λ*ext: 633 nm
λ*V2: 477.1 nm
#dd0042
L: 45.18
a: 78.04
b: 27.51
λ*ext: 620 nm
λ*V2: 489.7 nm
#89716e
L: 50.02
a: 9.15
b: 5.23
λ*ext: 662 nm
λ*V2: 447.5 nm
#916e6b
L: 50.03
a: 13.67
b: 6.89
λ*ext: 662 nm
λ*V2: 448.1 nm
#996b69
L: 50.06
a: 18.21
b: 8.5
λ*ext: 659 nm
λ*V2: 450.6 nm
#a16866
L: 50.07
a: 22.77
b: 10.11
λ*ext: 658 nm
λ*V2: 451.6 nm
#a86464
L: 50.08
a: 27.36
b: 11.67
λ*ext: 656 nm
λ*V2: 453.9 nm
#af6062
L: 50.1
a: 31.93
b: 13.27
λ*ext: 654 nm
λ*V2: 455.9 nm
#b65c5f
L: 50.11
a: 36.5
b: 14.87
λ*ext: 652 nm
λ*V2: 457.9 nm
#bc575d
L: 50.13
a: 41.1
b: 16.43
λ*ext: 649 nm
λ*V2: 461.2 nm
#c3525b
L: 50.15
a: 45.69
b: 18.01
λ*ext: 646 nm
λ*V2: 463.7 nm
#c94d58
L: 50.17
a: 50.29
b: 19.55
λ*ext: 642 nm
λ*V2: 467.7 nm
#cf4656
L: 50.18
a: 54.9
b: 21.06
λ*ext: 638 nm
λ*V2: 471.7 nm
#d63f54
L: 50.2
a: 59.51
b: 22.61
λ*ext: 636 nm
λ*V2: 474.5 nm
#dc3752
L: 50.21
a: 64.13
b: 24.16
λ*ext: 630 nm
λ*V2: 479.7 nm
#e22c50
L: 50.21
a: 68.8
b: 25.52
λ*ext: 624 nm
λ*V2: 485.6 nm
#e81c4e
L: 50.22
a: 73.49
b: 26.77
λ*ext: 618 nm
λ*V2: 492.5 nm
#ee004c
L: 50.21
a: 78.18
b: 28.12
λ*ext: 609 nm
λ*V2: 501.4 nm
#977d7a
L: 55.02
a: 9.5
b: 5.51
λ*ext: 648 nm
λ*V2: 462.1 nm
#a07a77
L: 55.03
a: 14.03
b: 7.14
λ*ext: 646 nm
λ*V2: 464 nm
#a77775
L: 55.05
a: 18.58
b: 8.74
λ*ext: 643 nm
λ*V2: 466.7 nm
#af7473
L: 55.07
a: 23.15
b: 10.31
λ*ext: 640 nm
λ*V2: 469.6 nm
#b67070
L: 55.08
a: 27.71
b: 11.93
λ*ext: 639 nm
λ*V2: 470.4 nm
#be6c6e
L: 55.1
a: 32.29
b: 13.49
λ*ext: 637 nm
λ*V2: 473.3 nm
#c5686b
L: 55.11
a: 36.87
b: 15.07
λ*ext: 634 nm
λ*V2: 475.9 nm
#cb6469
L: 55.13
a: 41.46
b: 16.58
λ*ext: 630 nm
λ*V2: 480.1 nm
#d25f66
L: 55.15
a: 46.03
b: 18.25
λ*ext: 629 nm
λ*V2: 481.1 nm
#d95a64
L: 55.17
a: 50.63
b: 19.82
λ*ext: 625 nm
λ*V2: 485.3 nm
#df5462
L: 55.18
a: 55.23
b: 21.35
λ*ext: 621 nm
λ*V2: 488.7 nm
#e64d5f
L: 55.2
a: 59.83
b: 22.92
λ*ext: 617 nm
λ*V2: 493 nm
#ec465d
L: 55.21
a: 64.45
b: 24.44
λ*ext: 612 nm
λ*V2: 498.4 nm
#f23d5b
L: 55.22
a: 69.07
b: 25.97
λ*ext: 607 nm
λ*V2: 503.6 nm
#f83259
L: 55.23
a: 73.71
b: 27.41
λ*ext: 600 nm
λ*V2: 509.8 nm
#fe2357
L: 55.24
a: 78.34
b: 28.93
λ*ext: 596 nm
λ*V2: 513.9 nm
#a68a86
L: 60.02
a: 9.88
b: 5.74
λ*ext: 630 nm
λ*V2: 480.2 nm
#ae8784
L: 60.04
a: 14.41
b: 7.35
λ*ext: 627 nm
λ*V2: 483 nm
#b68481
L: 60.05
a: 18.94
b: 8.99
λ*ext: 625 nm
λ*V2: 485.2 nm
#be807f
L: 60.07
a: 23.49
b: 10.6
λ*ext: 623 nm
λ*V2: 487.3 nm
#c57d7c
L: 60.08
a: 28.08
b: 12.14
λ*ext: 621 nm
λ*V2: 488.9 nm
#cd797a
L: 60.1
a: 32.65
b: 13.72
λ*ext: 617 nm
λ*V2: 492.6 nm
#d47577
L: 60.11
a: 37.23
b: 15.3
λ*ext: 615 nm
λ*V2: 494.9 nm
#db7175
L: 60.13
a: 41.8
b: 16.9
λ*ext: 612 nm
λ*V2: 498.1 nm
#e26c72
L: 60.15
a: 46.38
b: 18.49
λ*ext: 608 nm
λ*V2: 501.6 nm
#e96770
L: 60.17
a: 50.97
b: 20.03
λ*ext: 605 nm
λ*V2: 505.5 nm
#ef616e
L: 60.18
a: 55.58
b: 21.58
λ*ext: 601 nm
λ*V2: 509 nm
#f65b6b
L: 60.2
a: 60.16
b: 23.21
λ*ext: 597 nm
λ*V2: 513.3 nm
#fc5469
L: 60.21
a: 64.77
b: 24.72
λ*ext: 591 nm
λ*V2: 519.2 nm
#ff4d67
L: 60.22
a: 69.38
b: 26.28
λ*ext: 584 nm
λ*V2: 525.6 nm
#b49793
L: 65.02
a: 10.25
b: 5.97
λ*ext: 610 nm
λ*V2: 499.8 nm
#bc9490
L: 65.04
a: 14.78
b: 7.59
λ*ext: 607 nm
λ*V2: 502.5 nm
#c5918e
L: 65.05
a: 19.31
b: 9.21
λ*ext: 604 nm
λ*V2: 505.7 nm
#cd8d8b
L: 65.07
a: 23.87
b: 10.8
λ*ext: 602 nm
λ*V2: 508.3 nm
#d48a89
L: 65.08
a: 28.45
b: 12.37
λ*ext: 599 nm
λ*V2: 510.6 nm
#dc8686
L: 65.1
a: 33.02
b: 13.95
λ*ext: 597 nm
λ*V2: 513.1 nm
#e38284
L: 65.11
a: 37.59
b: 15.53
λ*ext: 593 nm
λ*V2: 517.4 nm
#eb7e81
L: 65.13
a: 42.17
b: 17.13
λ*ext: 589 nm
λ*V2: 520.7 nm
#f2797f
L: 65.15
a: 46.75
b: 18.7
λ*ext: 585 nm
λ*V2: 524.6 nm
#f9747c
L: 65.16
a: 51.32
b: 20.31
λ*ext: 582 nm
λ*V2: 528.4 nm
#ff6f7a
L: 65.18
a: 55.91
b: 21.89
λ*ext: 577 nm
λ*V2: 533.3 nm
#ff6977
L: 65.2
a: 60.5
b: 23.45
λ*ext: 572 nm
λ*V2: 538.2 nm
#ff6375
L: 65.21
a: 65.09
b: 25.04
λ*ext: 569 nm
λ*V2: 541.2 nm
#c2a4a0
L: 70.02
a: 10.64
b: 6.18
λ*ext: 587 nm
λ*V2: 522.5 nm
#cba19d
L: 70.04
a: 15.16
b: 7.81
λ*ext: 584 nm
λ*V2: 525.8 nm
#d49d9b
L: 70.05
a: 19.69
b: 9.42
λ*ext: 581 nm
λ*V2: 529 nm
#dc9a98
L: 70.07
a: 24.25
b: 11.02
λ*ext: 579 nm
λ*V2: 531.4 nm
#e49795
L: 70.08
a: 28.82
b: 12.57
λ*ext: 576 nm
λ*V2: 534.4 nm
#eb9393
L: 70.09
a: 33.38
b: 14.19
λ*ext: 572 nm
λ*V2: 537.5 nm
#f38f90
L: 70.11
a: 37.95
b: 15.76
λ*ext: 568 nm
λ*V2: 542 nm
#fa8b8e
L: 70.13
a: 42.52
b: 17.35
λ*ext: 565 nm
λ*V2: 545.2 nm
#ff868b
L: 70.14
a: 47.1
b: 18.94
λ*ext: 560 nm
λ*V2: 550 nm
#ff8189
L: 70.16
a: 51.67
b: 20.54
λ*ext: 556 nm
λ*V2: 553.6 nm
#ff7c86
L: 70.18
a: 56.24
b: 22.17
λ*ext: 553 nm
λ*V2: 556.6 nm
#d1b1ad
L: 75.02
a: 11.03
b: 6.37
λ*ext: 562 nm
λ*V2: 548.4 nm
#daaeaa
L: 75.04
a: 15.55
b: 7.99
λ*ext: 558 nm
λ*V2: 552.2 nm
#e3aba7
L: 75.05
a: 20.08
b: 9.62
λ*ext: 555 nm
λ*V2: 555.1 nm
#eba7a5
L: 75.06
a: 24.62
b: 11.23
λ*ext: 552 nm
λ*V2: 557.7 nm
#f3a4a2
L: 75.08
a: 29.19
b: 12.81
λ*ext: 549 nm
λ*V2: 561.1 nm
#fba0a0
L: 75.09
a: 33.75
b: 14.42
λ*ext: 546 nm
λ*V2: 564.1 nm
#ff9c9d
L: 75.11
a: 38.31
b: 16.01
λ*ext: 542 nm
λ*V2: 568.2 nm
#ff989a
L: 75.12
a: 42.87
b: 17.63
λ*ext: 537 nm
λ*V2: 572.3 nm
#ff9398
L: 75.14
a: 47.46
b: 19.15
λ*ext: 534 nm
λ*V2: 575.9 nm
#e0beba
L: 80.02
a: 11.41
b: 6.59
λ*ext: 532 nm
λ*V2: 577.5 nm
#e9bbb7
L: 80.04
a: 15.93
b: 8.22
λ*ext: 529 nm
λ*V2: 580.5 nm
#f2b8b5
L: 80.05
a: 20.46
b: 9.84
λ*ext: 526 nm
λ*V2: 584.4 nm
#fab5b2
L: 80.06
a: 25
b: 11.45
λ*ext: 523 nm
λ*V2: 586.8 nm
#ffb1af
L: 80.08
a: 29.56
b: 13.05
λ*ext: 520 nm
λ*V2: 589.9 nm
#ffadad
L: 80.09
a: 34.14
b: 14.59
λ*ext: 515 nm
λ*V2: 594.7 nm
#ffa9aa
L: 80.11
a: 38.69
b: 16.21
λ*ext: 514 nm
λ*V2: 596 nm
#efccc7
L: 85.02
a: 11.78
b: 6.82
λ*ext: 501 nm
λ*V2: 609.1 nm
#f9c9c5
L: 85.04
a: 16.29
b: 8.46
λ*ext: 498 nm
λ*V2: 612.5 nm
#ffc5c2
L: 85.05
a: 20.84
b: 10.04
λ*ext: 493 nm
λ*V2: 616.7 nm
#ffc2bf
L: 85.06
a: 25.38
b: 11.67
λ*ext: 490 nm
λ*V2: 620.2 nm
#ffdad5
L: 90.02
a: 12.17
b: 7.03
λ*ext: 465 nm
λ*V2: 645.2 nm
#ffd6d2
L: 90.04
a: 16.68
b: 8.67
λ*ext: 463 nm
λ*V2: 646.9 nm
