Black Sabbath as a scale
Eleven steps from #220022, built by moving lightness in OKLCh and keeping the hue where it is. Every step is gamut-mapped by giving up chroma, never by clipping channels — clipping is what turns a light blue purple.
| Stop | Hex | OKLCh L | Chroma | On white | On black | APCA on white | ΔE00 from the step above |
|---|---|---|---|---|---|---|---|
| 50 | #fff0fe | 97.0% | 0.025 ·capped | 1.10:1 | 19.09:1 | 0 | — |
| 100 | #ffdffd | 93.8% | 0.053 ·capped | 1.22:1 | 17.18:1 | 11 | 7.5 |
| 200 | #f4c3f1 | 87.4% | 0.081 | 1.51:1 | 13.92:1 | 24 | 7.2 |
| 300 | #dfafdb | 81.0% | 0.081 | 1.87:1 | 11.25:1 | 35 | 5.1 |
| 400 | #ca9bc7 | 74.6% | 0.081 | 2.34:1 | 8.98:1 | 46 | 5.5 |
| 500 | #b587b2 | 68.2% | 0.081 | 2.97:1 | 7.08:1 | 56 | 6.1 |
| 600 | #a1749e | 61.8% | 0.081 | 3.82:1 | 5.50:1 | 66 | 6.7 |
| 700 | #8d618b | 55.4% | 0.081 | 4.97:1 | 4.22:1 | 74 | 7.4 |
| 800 | #7a4f78 | 49.0% | 0.081 | 6.54:1 | 3.21:1 | 82 | 6.9 |
| 900 | #4e274d | 34.0% | 0.081 | 12.22:1 | 1.72:1 | 98 | 13.6 |
| 950 | #230023 | 18.0% | 0.081 | 19.15:1 | 1.10:1 | 105 | 11.7 |
What is true of this ramp
- 10 of the 10 adjacent pairs differ by ΔE00 2 or more. Every step here is a step a reader can see.
- The tightest pair is 200 to300, at ΔE00 5.1.
- 2 steps had to give up chroma to stay inside sRGB — 50, 100. A wider display would show them more vividly.
- 4 steps clear 4.5:1 on white (700, 800, 900, 950), and 7 on black (50, 100, 200, 300, 400, 500, 600).
Harmonies from Black Sabbath
complement
the hue directly opposite, at the same lightness. #001704 (+180°) — chroma capped by sRGB.
analogous
the two neighbours 30° either side. #17042f (+-30°), #270011 (+30°) — chroma capped by sRGB.
split complement
the two hues either side of the opposite, 30° apart from it. #0f1300 (+150°), #001511 (+210°) — chroma capped by sRGB.
triad
the circle divided in three. #171000 (+120°), #001418 (+240°) — chroma capped by sRGB.
tetrad
the circle divided in four. #1e0b00 (+90°), #001704 (+180°), #001320 (+270°) — chroma capped by sRGB.
The ramp as CSS
:root {
--black-sabbath-50: #fff0fe;
--black-sabbath-100: #ffdffd;
--black-sabbath-200: #f4c3f1;
--black-sabbath-300: #dfafdb;
--black-sabbath-400: #ca9bc7;
--black-sabbath-500: #b587b2;
--black-sabbath-600: #a1749e;
--black-sabbath-700: #8d618b;
--black-sabbath-800: #7a4f78;
--black-sabbath-900: #4e274d;
--black-sabbath-950: #230023;
}