avoir des arrières plans blancs sur les previews de PDF générés automatiquement

imagick-bg-white-pdf.php

<?php

require_once ABSPATH . 'wp-includes/class-wp-image-editor.php';
require_once ABSPATH . 'wp-includes/class-wp-image-editor-imagick.php';

final class ExtendedWpImageEditorImagick extends \WP_Image_Editor_Imagick
{
    protected function pdf_load_source()
    {
        $loaded = parent::pdf_load_source();

        try {
            $this->image->setImageAlphaChannel(\Imagick::ALPHACHANNEL_REMOVE);
            $this->image->setBackgroundColor('white');
        } catch (\Exception $exception) {
            error_log($exception->getMessage());
        }

        return $loaded;
    }
}

add_filter('wp_image_editors', function (array $editors) {
    array_unshift($editors, ExtendedWpImageEditorImagick::class);
    return $editors;
});