Image not resizing when added programmatically prestashop - prestashop

Question

I am abel to add image programmatically. But images are not getting resized. In other words resized images are not generating. Attaching the code I use:
$image = new Image();
$image_url = 'http://i.imgur.com/0zSw2gl.jpg';
$id_image = Product::getCover($id_product);
$shops = Shop::getShops(true, null, true);
$image->id_product = $id_product;
$image->position = Image::getHighestPosition($id_product) + 1;
$image->cover = true; // or false;
if (($image->validateFields(false, true)) === true &&
($image->validateFieldsLang(false, true)) === true && $image->add())
{
$image->associateTo($shops);
if (!AdminImportControllerExtended::copyImgCustom($id_product, $image->id, $image_url, 'products', false))
{
$image->delete();
}
}

Answer 1

Images should be resized programatically
I use this code
$image = new Image();
$image->id_product = (int)$product->id;
$image->position = Image::getHighestPosition($product->id) + 1;
$image->cover = 1;
if (!$image->add())
exit(Tools::jsonEncode(array('error' => Tools::displayError('Error while creating additional image'))));
else
{
$new_path = $image->getPathForCreation();
ImageManager::resize($image_path, $new_path.'.'.$image->image_format);
$images_types = ImageType::getImagesTypes('products');
foreach ($images_types as $image_type)
{
if (!ImageManager::resize($image_path, $new_path.'-'.Tools::stripslashes($image_type['name']).'.'.
$image->image_format, $image_type['width'], $image_type['height'], $image->image_format))
exit(Tools::jsonEncode(array('error' => Tools::displayError('An error occurred while copying image:').
' '.Tools::stripslashes($image_type['name']))));
}
$image->update();
}