CoMa – PHP Color Math Library

Php library to convert between sRGB, XYZ, and Lab color spaces, and calculate various color distance metrics (delta E).

Currently CIE76, CIE94 and CIEDE2000 are implemented.

use Biano\Coma\ColorDistance;
use Biano\Coma\sRGB;

$color1 = new sRGB(1, 5, 250);
$color2 = new sRGB(0, 0, 208);

$cd = new ColorDistance;
$cie94 = $cd->cie94($color1, $color2);

echo 'The CIE94 ∆E is ' . $cie94 . ' between ' . $color1->toHex() . ' and ' . $color2->toHex() . '.';