tc-lib-color

PHP color toolkit for conversion and normalization across common color models.

💖 Part of the tc-lib-pdf / TCPDF ecosystem (100M+ installs). Sponsor its maintenance →

Overview

tc-lib-color provides utilities for parsing, converting, and formatting color values used in web and PDF rendering pipelines.

The library is designed to centralize color logic so applications avoid ad-hoc conversion code and rounding drift across modules. It provides a consistent normalization layer that helps keep visual output aligned between browser previews and final PDF rendering.

Features

Color Models

• Grayscale (GRAY)
• RGB/RGBA and hexadecimal color handling (RGB)
• HSL/HSLA conversion workflows (HSL)
• CMYK conversion workflows (CMYK)
• CIE Lab color handling and conversion workflows (LAB)
• Spot colors (Separation), with DeviceCMYK and Lab alternate color-space support for PDF output

Integration Helpers

• CSS-ready color output
• PDF-oriented color conversion helpers
• Cross-model conversion helpers on all color models
• Named web color lookup and normalization

Requirements

• PHP 8.2 or later
• Composer

Installation

composer require tecnickcom/tc-lib-color

Quick Start

<?php

require_once __DIR__ . '/vendor/autoload.php';

$web = new \Com\Tecnick\Color\Web();
$rgb = $web->getRgbObjFromHex('#336699');

echo $rgb->getCssColor();

See example/index.php for a complete conversion showcase.

Development

make deps
make help
make qa
make server

Run make server and open http://127.0.0.1:8000/example/index.php to check the example in a browser.

Packaging

make rpm
make deb

For system packages, bootstrap with:

require_once '/usr/share/php/Com/Tecnick/Color/autoload.php';

Contributing

Contributions are welcome. Please review CONTRIBUTING.md, CODE_OF_CONDUCT.md, and SECURITY.md.