Atlas Cedar as a scale
Eleven steps from #5ca0a7, 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 | #defcff | 97.0% | 0.032 ·capped | 1.08:1 | 19.45:1 | 0 | — |
| 100 | #b6f8ff | 93.8% | 0.066 ·capped | 1.17:1 | 17.89:1 | 8 | 8.0 |
| 200 | #9ee4eb | 87.4% | 0.070 | 1.43:1 | 14.70:1 | 20 | 4.7 |
| 300 | #8acfd6 | 81.0% | 0.070 | 1.76:1 | 11.93:1 | 32 | 5.0 |
| 400 | #76bac1 | 74.6% | 0.070 | 2.20:1 | 9.56:1 | 43 | 5.4 |
| 500 | #62a6ad | 68.2% | 0.070 | 2.78:1 | 7.56:1 | 53 | 5.9 |
| 600 | #4e9299 | 61.8% | 0.070 | 3.56:1 | 5.89:1 | 63 | 6.5 |
| 700 | #3a7f86 | 55.4% | 0.070 | 4.63:1 | 4.54:1 | 72 | 7.3 |
| 800 | #256c73 | 49.0% | 0.070 | 6.07:1 | 3.46:1 | 80 | 7.1 |
| 900 | #004046 | 34.0% | 0.058 ·capped | 11.48:1 | 1.83:1 | 96 | 14.2 |
| 950 | #001518 | 18.0% | 0.031 ·capped | 18.70:1 | 1.12:1 | 105 | 15.1 |
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 100 to200, at ΔE00 4.7.
- 4 steps had to give up chroma to stay inside sRGB — 50, 100, 900, 950. A wider display would show them more vividly.
- 4 steps clear 4.5:1 on white (700, 800, 900, 950), and 8 on black (50, 100, 200, 300, 400, 500, 600, 700).
Harmonies from Atlas Cedar
complement
the hue directly opposite, at the same lightness. #ba837e (+180°)
analogous
the two neighbours 30° either side. #64a290 (+-30°), #679bb8 (+30°)
split complement
the two hues either side of the opposite, 30° apart from it. #b68296 (+150°), #b5886a (+210°)
triad
the circle divided in three. #a985ac (+120°), #a79061 (+240°)
tetrad
the circle divided in four. #958bba (+90°), #ba837e (+180°), #929866 (+270°)
The ramp as CSS
:root {
--atlas-cedar-50: #defcff;
--atlas-cedar-100: #b6f8ff;
--atlas-cedar-200: #9ee4eb;
--atlas-cedar-300: #8acfd6;
--atlas-cedar-400: #76bac1;
--atlas-cedar-500: #62a6ad;
--atlas-cedar-600: #4e9299;
--atlas-cedar-700: #3a7f86;
--atlas-cedar-800: #256c73;
--atlas-cedar-900: #004046;
--atlas-cedar-950: #001518;
}