woutersf/drupal8_image_style_url.php

## drupal8_image_style_url.php
<?php
use Drupal\image\Entity\ImageStyle;
use \Drupal\file\Entity\File;

//Load the file
$file_id = 2;
$file = file_load($file_id);

//Render the IMage style "large"
$image_large_url = ImageStyle::load('large')->buildUrl($file->getFileUri());
	<?php
	use Drupal\image\Entity\ImageStyle;
	use \Drupal\file\Entity\File;

	//Load the file
	$file_id = 2;
	$file = file_load($file_id);

	//Render the IMage style "large"
	$image_large_url = ImageStyle::load('large')->buildUrl($file->getFileUri());