Slate
A mid, cool indigo -- the dependable foundation of trustworthy interfaces.
Create Slate 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;
$slate = Color::parse('#64748B');ColorInterface
$slate
#64748b · oklch(0.5544 0.0407 257.4)
Build a Slate harmony
tetradic() keeps Slate and adds three partners at equal quarter-turns around the OKLCH hue wheel.
<?php
$harmony = $slate->tetradic();
foreach ($harmony as $color) {
echo $color->toHex().PHP_EOL;
}- 0
#64748b - 1
#856977 - 2
#807058 - 3
#5c7b6e
Generate a Slate scale
Keep the original hue and chroma, then vary OKLCH lightness to produce perceptually ordered steps.
<?php
$oklch = $slate->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 Slate for the web
The same object can emit a compact Hex value, an sRGB CSS function, or its perceptual OKLCH coordinates.
<?php
$hex = $slate->toHex();
$rgb = $slate->toCss('srgb');
$oklch = $slate->to('oklch')->toCss();- hex
#64748b- rgb
rgb(100 116 139)- oklch
oklch(0.554391 0.040717 257.417)