Royal Blue
A mid, cool indigo -- the dependable foundation of trustworthy interfaces.
Create Royal Blue 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;
$royalBlue = Color::parse('#4169E1');ColorInterface
$royalBlue
#4169e1 · oklch(0.5598 0.1882 266.4)
Build a Royal Blue harmony
tetradic() keeps Royal Blue and adds three partners at equal quarter-turns around the OKLCH hue wheel.
<?php
$harmony = $royalBlue->tetradic();
foreach ($harmony as $color) {
echo $color->toHex().PHP_EOL;
}- 0
#4169e1 - 1
#c33377 - 2
#a46700 - 3
#009571
Generate a Royal Blue scale
Keep the original hue and chroma, then vary OKLCH lightness to produce perceptually ordered steps.
<?php
$oklch = $royalBlue->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 Royal Blue for the web
The same object can emit a compact Hex value, an sRGB CSS function, or its perceptual OKLCH coordinates.
<?php
$hex = $royalBlue->toHex();
$rgb = $royalBlue->toCss('srgb');
$oklch = $royalBlue->to('oklch')->toCss();- hex
#4169e1- rgb
rgb(65 105 225)- oklch
oklch(0.559848 0.188234 266.4)