Gunmetal
A dark, cool blue -- the dependable foundation of trustworthy interfaces.
Create Gunmetal 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;
$gunmetal = Color::parse('#2A3439');ColorInterface
$gunmetal
#2a3439 · oklch(0.3178 0.0162 229.5)
Tint Gunmetal for a system
Gunmetal is a neutral, so rotating its hue changes nothing. Design systems rarely ship a pure neutral either: give it a trace of chroma and it belongs to the palette around it.
<?php
$neutral = $gunmetal->to('oklch');
foreach (['warm' => 60, 'fresh' => 150, 'cool' => 250] as $name => $hue) {
echo $neutral->withChannel('c', 0.02)->withChannel('h', $hue)->toHex().PHP_EOL;
}- Warm
#3a3028 - Fresh
#2b352d - Cool
#2b333c
Generate a Gunmetal scale
Keep the original hue and chroma, then vary OKLCH lightness to produce perceptually ordered steps.
<?php
$oklch = $gunmetal->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 Gunmetal for the web
The same object can emit a compact Hex value, an sRGB CSS function, or its perceptual OKLCH coordinates.
<?php
$hex = $gunmetal->toHex();
$rgb = $gunmetal->toCss('srgb');
$oklch = $gunmetal->to('oklch')->toCss();- hex
#2a3439- rgb
rgb(42 52 57)- oklch
oklch(0.317797 0.0162408 229.543)