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Watermarking uploads in WordPress with Imagemagick
function register_watermarked_size() {
add_image_size( 'watermarked', 550, 550, true ); // This is what should be uploaded
}
add_action( 'init', 'register_watermarked_size' );
class Watermark_Image {
// The attachment meta array
public $meta = array();
// The upload dir (including year and month)
private $upload_dir = '';
// The path to the uploaded and unprocessed file
private $uploaded_file_path = '';
public function __construct($meta) {
$this->meta = $meta;
$this->generate();
}
public function get_meta() {
return $this->meta;
}
public function generate() {
$time = substr( $this->meta['file'], 0, 7 );
$this->upload_dir = wp_upload_dir( $time );
$filename = $this->meta['sizes']['watermarked']['file'];
$this->uploaded_file_path = trailingslashit( $this->upload_dir['path'] ) . $filename;
$this->watermark_image();
}
private function watermark_image() {
$image_resource = new Imagick( $this->uploaded_file_path );
$image_resource->blurImage( 20, 10 );
$watermark_resource = new Imagick( get_stylesheet_directory() . '/images/codeable-logo.png' );
$image_resource->compositeImage( $watermark_resource, Imagick::COMPOSITE_DEFAULT, 100, 250 );
$this->save_image( $image_resource );
}
private function save_image( $image_resource ) {
$image_data = pathinfo( $this->uploaded_file_path );
$watermarked_filename = $image_data['filename'] . '-watermarked.' . $image_data['extension'];
$watermarked_file_path = str_replace( $image_data['basename'], $watermarked_filename, $this->uploaded_file_path );
if ( ! $image_resource->writeImage( $watermarked_file_path ) )
return $image_data['basename'];
unlink( $this->uploaded_file_path ); // Because that file isn't referred to anymore
$this->meta['sizes']['watermarked']['file'] = $watermarked_filename;
}
}
function generate_watermarked_image( $meta ) {
$watermark_image = new Watermark_Image( $meta );
$meta = $watermark_image->get_meta();
return $meta;
}
add_filter( 'wp_generate_attachment_metadata', 'generate_watermarked_image' );
function register_watermarked_size() {
add_image_size( 'watermarked', 550, 550, true ); // This is what should be uploaded
}
add_action( 'init', 'register_watermarked_size' );
function generate_watermarked_image( $meta ) {
$time = substr( $meta['file'], 0, 7); // Extract the date in form "2015/04"
$upload_dir = wp_upload_dir( $time ); // Get the "proper" upload dir
$filename = $meta['sizes']['watermarked']['file'];
$meta['sizes']['watermarked']['file'] = watermark_image( $filename, $upload_dir );
return $meta;
}
add_filter( 'wp_generate_attachment_metadata', 'generate_watermarked_image' );
function watermark_image( $filename, $upload_dir ) {
$original_image_path = trailingslashit( $upload_dir['path'] ) . $filename;
$image_resource = new Imagick( $original_image_path );
$image_resource->blurImage( 20, 10 );
$watermark_resource = new Imagick( get_stylesheet_directory() . '/images/codeable-logo.png' );
$image_resource->compositeImage( $watermark_resource, Imagick::COMPOSITE_DEFAULT, 100, 250 );
return save_watermarked_image( $image_resource, $original_image_path );
}
function save_watermarked_image( $image_resource, $original_image_path ) {
$image_data = pathinfo( $original_image_path );
$new_filename = $image_data['filename'] . '-watermarked.' . $image_data['extension'];
$watermarked_image_path = str_replace($image_data['basename'], $new_filename, $original_image_path);
if ( ! $image_resource->writeImage( $watermarked_image_path ) )
return $image_data['basename'];
unlink( $original_image_path ); // Because that file isn't referred to anymore
return $new_filename;
}
@drewbaker

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@drewbaker drewbaker commented Dec 18, 2015

Noticed that if you upload an image that is the same 550, 550 size, no watermarked image will be generated. Any ideas on how to always generate an image?

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@drewbaker drewbaker commented Dec 20, 2015

I have a StackOverflow question about how to improve this here: http://stackoverflow.com/questions/34377231/wordpress-blur-image-on-upload

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