Codeigniter Image Watermark

Last updated on December 5, 2022

You can easily watermark images in CodeIgniter by using CI’s image manipulation class. In CI Watermarking is only available using the GD/GD2 library.

CI’s image manipulation library allows us to do, image watermark in two ways with tiny configuration changes.

1. Text watermark. (wm_text)
2. Image over relay watermark. (wm_overlay_path)

Below is my Watermarkdemo controller, you will find both text and overlay examples in the controller.

if (!defined('BASEPATH')) {
    exit('No direct script access allowed');
}
class Watermarkdemo extends \CI_Controller
{
    public function __construct()
    {
        parent::__construct();
        $this->load->library('image_lib');
    }
    public function text()
    {
        $config['source_image'] = './uploads/text.jpg';
        //The image path,which you would like to watermarking
        $config['wm_text'] = 'arjunphp.com';
        $config['wm_type'] = 'text';
        $config['wm_font_path'] = './fonts/atlassol.ttf';
        $config['wm_font_size'] = 16;
        $config['wm_font_color'] = 'ffffff';
        $config['wm_vrt_alignment'] = 'middle';
        $config['wm_hor_alignment'] = 'right';
        $config['wm_padding'] = '20';
        $this->image_lib->initialize($config);
        if (!$this->image_lib->watermark()) {
            echo $this->image_lib->display_errors();
        } else {
            echo 'Successfully updated image with watermark';
        }
    }
    public function overlay()
    {
        $config['image_library'] = 'gd2';
        $config['source_image'] = './uploads/over.jpg';
        $config['wm_type'] = 'overlay';
        $config['wm_overlay_path'] = './uploads/logo.png';
        //the overlay image
        $config['wm_opacity'] = 50;
        $config['wm_vrt_alignment'] = 'middle';
        $config['wm_hor_alignment'] = 'right';
        $this->image_lib->initialize($config);
        if (!$this->image_lib->watermark()) {
            echo $this->image_lib->display_errors();
        } else {
            echo 'Successfully updated image with watermark';
        }
    }
}

That’s it. you just need to pass the correct image, font, and overlay image paths to the config array Now you can point your browsers to http://yourDomain//watermarkdemo/overlay or http://yourDomain/index.php/watermarkdemo/overlay then check the upload directory in the root.