Repair a triadic palette

Realign an uneven three-color palette to triadic hue angles while keeping its names and perceptual character.

Set the intended harmony instead of manually guessing replacement hues:

use PhpColor\Color\Palette\ColorPalette;
use PhpColor\Color\Palette\Fixer\HarmonyFixer;
use PhpColor\Color\Palette\Harmony\HarmonyPattern;

$source = ColorPalette::parse([
    'primary' => '#776aa6',
    'secondary' => '#c8ae66',
    'accent' => '#65a6bd',
]);

$fixed = (new HarmonyFixer())->fix($source, [
    'target_harmony' => HarmonyPattern::Triadic,
]);

assert([
    'primary' => '#776aa6',
    'secondary' => '#e19f76',
    'accent' => '#68ab97',
] === $fixed->toHex());

By default, the fixer anchors the first color and preserves each entry's OKLCH lightness and chroma. It does not check token contrast.

See palette repair or HarmonyFixer.