diff --git orig/core/modules/image/src/PathProcessor/PathProcessorImageStyles.php mods/core/modules/image/src/PathProcessor/PathProcessorImageStyles.php
index f40d083..c7bb084 100644
--- orig/core/modules/image/src/PathProcessor/PathProcessorImageStyles.php
+++ mods/core/modules/image/src/PathProcessor/PathProcessorImageStyles.php
@@ -3,6 +3,7 @@
 namespace Drupal\image\PathProcessor;
 
 use Drupal\Core\PathProcessor\InboundPathProcessorInterface;
+use Drupal\Core\Site\Settings;
 use Drupal\Core\StreamWrapper\StreamWrapperManagerInterface;
 use Symfony\Component\HttpFoundation\Request;
 
@@ -44,9 +45,20 @@ class PathProcessorImageStyles implements InboundPathProcessorInterface {
    * {@inheritdoc}
    */
   public function processInbound($path, Request $request) {
-    $directory_path = $this->streamWrapperManager->getViaScheme('public')->getDirectoryPath();
-    if (strpos($path, '/' . $directory_path . '/styles/') === 0) {
-      $path_prefix = '/' . $directory_path . '/styles/';
+    $directory_path = NULL;
+    $files_base_url = Settings::get('file_public_base_url', '');
+    if ($files_base_url) {
+      $url_parts = parse_url($files_base_url);
+      if (isset($url_parts['path'])) {
+        $directory_path = $url_parts['path'];
+      }
+    }
+    if (!$directory_path) {
+      $directory_path = '/' . $this->streamWrapperManager->getViaScheme('public')->getDirectoryPath();
+    }
+
+    if (strpos($path, $directory_path . '/styles/') === 0) {
+      $path_prefix = $directory_path . '/styles/';
     }
     // Check if the string '/system/files/styles/' exists inside the path,
     // that means we have a case of private file's image style.
diff --git orig/core/modules/image/src/Routing/ImageStyleRoutes.php mods/core/modules/image/src/Routing/ImageStyleRoutes.php
index ed414e2..fd68d1a 100644
--- orig/core/modules/image/src/Routing/ImageStyleRoutes.php
+++ mods/core/modules/image/src/Routing/ImageStyleRoutes.php
@@ -3,6 +3,7 @@
 namespace Drupal\image\Routing;
 
 use Drupal\Core\DependencyInjection\ContainerInjectionInterface;
+use Drupal\Core\Site\Settings;
 use Drupal\Core\StreamWrapper\StreamWrapperManagerInterface;
 use Symfony\Component\DependencyInjection\ContainerInterface;
 use Symfony\Component\Routing\Route;
@@ -50,10 +51,20 @@ class ImageStyleRoutes implements ContainerInjectionInterface {
     // disabled image derivatives will always be served through the menu system.
     // If clean URLs are enabled and the image derivative already exists, PHP
     // will be bypassed.
-    $directory_path = $this->streamWrapperManager->getViaScheme('public')->getDirectoryPath();
+    $directory_path = NULL;
+    $files_base_url = Settings::get('file_public_base_url', '');
+    if ($files_base_url) {
+      $url_parts = parse_url($files_base_url);
+      if (isset($url_parts['path'])) {
+        $directory_path = $url_parts['path'];
+      }
+    }
+    if (!$directory_path) {
+      $directory_path = '/' . $this->streamWrapperManager->getViaScheme('public')->getDirectoryPath();
+    }
 
     $routes['image.style_public'] = new Route(
-      '/' . $directory_path . '/styles/{image_style}/{scheme}',
+      $directory_path . '/styles/{image_style}/{scheme}',
       [
         '_controller' => 'Drupal\image\Controller\ImageStyleDownloadController::deliver',
       ],