Ultramarine
A dark, cool indigo -- the dependable foundation of trustworthy interfaces.
Create Ultramarine in PHP
Parse the catalog’s canonical value once, then keep the resulting color object throughout the rest of your code.
<?php
use PhpColor\Color\Color;
$ultramarine = Color::parse('#120A8F');ColorInterface
$ultramarine
#120a8f · oklch(0.3073 0.1944 268.5)
Build an Ultramarine harmony
tetradic() keeps Ultramarine and adds three partners at equal quarter-turns around the OKLCH hue wheel.
<?php
$harmony = $ultramarine->tetradic();
foreach ($harmony as $color) {
echo $color->toHex().PHP_EOL;
}- 0
#120a8f - 1
#6e002e - 2
#561c00 - 3
#004830
Generate an Ultramarine scale
Keep the original hue and chroma, then vary OKLCH lightness to produce perceptually ordered steps.
<?php
$oklch = $ultramarine->to('oklch');
foreach ([0.97, 0.92, 0.84, 0.74, 0.66, 0.58, 0.48, 0.40, 0.32, 0.24, 0.16] as $lightness) {
$step = $oklch->withChannel('l', $lightness);
}50
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Format Ultramarine for the web
The same object can emit a compact Hex value, an sRGB CSS function, or its perceptual OKLCH coordinates.
<?php
$hex = $ultramarine->toHex();
$rgb = $ultramarine->toCss('srgb');
$oklch = $ultramarine->to('oklch')->toCss();- hex
#120a8f- rgb
rgb(18 10 143)- oklch
oklch(0.307299 0.194397 268.462)