Cobalt
A deep, cool indigo -- the dependable foundation of trustworthy interfaces.
Create Cobalt 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;
$cobalt = Color::parse('#2563EB');ColorInterface
$cobalt
#2563eb · oklch(0.5461 0.2152 262.9)
Build a Cobalt harmony
tetradic() keeps Cobalt and adds three partners at equal quarter-turns around the OKLCH hue wheel.
<?php
$harmony = $cobalt->tetradic();
foreach ($harmony as $color) {
echo $color->toHex().PHP_EOL;
}- 0
#2563eb - 1
#c5167b - 2
#ab5b00 - 3
#009464
Generate a Cobalt scale
Keep the original hue and chroma, then vary OKLCH lightness to produce perceptually ordered steps.
<?php
$oklch = $cobalt->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 Cobalt for the web
The same object can emit a compact Hex value, an sRGB CSS function, or its perceptual OKLCH coordinates.
<?php
$hex = $cobalt->toHex();
$rgb = $cobalt->toCss('srgb');
$oklch = $cobalt->to('oklch')->toCss();- hex
#2563eb- rgb
rgb(37 99 235)- oklch
oklch(0.54615 0.215208 262.881)