Blue
A deep, cool indigo -- the dependable foundation of trustworthy interfaces.
Create 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;
$blue = Color::parse('#0000FF');ColorInterface
$blue
#0000ff · oklch(0.4520 0.3132 264.1)
Build a Blue harmony
tetradic() keeps Blue and adds three partners at equal quarter-turns around the OKLCH hue wheel.
<?php
$harmony = $blue->tetradic();
foreach ($harmony as $color) {
echo $color->toHex().PHP_EOL;
}- 0
#0000ff - 1
#c00061 - 2
#a02000 - 3
#008048
Generate a Blue scale
Keep the original hue and chroma, then vary OKLCH lightness to produce perceptually ordered steps.
<?php
$oklch = $blue->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 Blue for the web
The same object can emit a compact Hex value, an sRGB CSS function, or its perceptual OKLCH coordinates.
<?php
$hex = $blue->toHex();
$rgb = $blue->toCss('srgb');
$oklch = $blue->to('oklch')->toCss();- hex
#0000ff- rgb
rgb(0 0 255)- oklch
oklch(0.452014 0.313214 264.052)