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Hi,

here is a solution to generate images for one product only, it use also watermark module:

<?php
// Include PrestaShop's configuration file
require_once(dirname(__FILE__).'/config/config.inc.php');
require_once(dirname(__FILE__).'/init.php');

// Set the product ID for which to regenerate thumbnails
$productId = YOUR_PRODUCT_ID; // Replace YOUR_PRODUCT_ID with the actual product ID

// Load the product
$product = new Product((int)$productId);

// Load the product's images
$images = $product->getImages((int)Configuration::get('PS_LANG_DEFAULT'));

// Regenerate thumbnails for each image of the product
foreach ($images as $image) {
    // Create new Image object
    $imageObj = new Image((int)$image['id_image']);

    // Define the types of images to regenerate (you can modify this array with the types you want)
    $imageTypes = ImageType::getImagesTypes('products');
    
    // Regenerate thumbnails for each image type
    foreach ($imageTypes as $imageType) {
        $newImagePath = _PS_PROD_IMG_DIR_.$imageObj->getExistingImgPath().'-'.$imageType['name'].'.'.$imageObj->image_format;

        // Resize image
        if (!ImageManager::resize(
            _PS_PROD_IMG_DIR_.$imageObj->getExistingImgPath().'.'.$imageObj->image_format,
            $newImagePath,
            (int)$imageType['width'],
            (int)$imageType['height']
        )) {
            // Handle errors
            echo 'Error regenerating thumbnail for image ID ' . $image['id_image'] . ' for type ' . $imageType['name'];
            continue;
        }
        
        // Apply watermark if the module is installed and enabled
        $watermarkModule = Module::getInstanceByName('watermark');
        if ($watermarkModule && $watermarkModule->active) {
            // Check if the method 'hookActionWatermark' exists in the watermark module
            if (method_exists($watermarkModule, 'hookActionWatermark')) {
                // Prepare the hook arguments
                $hookArgs = array(
                    'image_type' => $imageType['name'],
                    'id_image' => $imageObj->id,
                    'id_product' => $product->id
                );

                // Call the watermark hook
                $watermarkModule->hookActionWatermark($hookArgs);
            }
        }
    }
}
?>