i use OKLCH color picker to choose colors for my pictures
the steps
i pick grey colors (without chroma) so i can see the contrast
then i add chroma and hue
Lightness
i use 12 lightnesses:
0 %
¹⁄₁₂ = 8.33 %
²⁄₁₂ = 16.67 %
³⁄₁₂ = 25 %
⁴⁄₁₂ = 33.33 %
⁵⁄₁₂ = 41.67 %
⁶⁄₁₂ = 50 %
⁷⁄₁₂ = 58.33 %
⁸⁄₁₂ = 66.67 %
⁹⁄₁₂ = 75 %
¹⁰⁄₁₂ = 83.33 %
¹¹⁄₁₂ = 91.67 %
100 %
if i want clear contrast between a background color and a foreground color, i make the foreground 5 steps lighter/darker than the background.
if i want visible contrast, the 2 Lightnesses are 4 steps away from each other.
if i want almost no contrast, the Lightnesses are only 1 – 3 steps away.
Hue
i may use any of the 360 hues.
when the Lightness between 2 same-hue colors gets lighter by 1 step, the hue gets 5° closer to red/yellow.
when it gets darker instead, the hue gets 5° closer to blue/purple.
Chroma
i don't have a system for choosing Chroma, except that i snap it to sixths:
0
⅙ × 0.1 = 0.02
²⁄₆ × 0.1 = 0.03
³⁄₆ × 0.1 = 0.05
⁴⁄₆ × 0.1 = 0.07
⁵⁄₆ × 0.1 = 0.08
0.1
⁷⁄₆ × 0.1 = 0.12
⁸⁄₆ × 0.1 = 0.13
⁹⁄₆ × 0.1 = 0.15
¹⁰⁄₆ × 0.1 = 0.17
¹¹⁄₆ × 0.1 = 0.18
2 × 0.1 = 0.2
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