diff --git a/core/modules/image/src/Entity/ImageStyle.php b/core/modules/image/src/Entity/ImageStyle.php
index 788afb2..96e442f 100644
--- a/core/modules/image/src/Entity/ImageStyle.php
+++ b/core/modules/image/src/Entity/ImageStyle.php
@@ -292,6 +292,7 @@ public function createDerivative($original_uri, $derivative_uri) {
       return FALSE;
     }
 
+    $this->getEffects()->resetRuntimeVariables();
     foreach ($this->getEffects() as $effect) {
       $effect->applyEffect($image);
     }
@@ -310,6 +311,7 @@ public function createDerivative($original_uri, $derivative_uri) {
    * {@inheritdoc}
    */
   public function transformDimensions(array &$dimensions, $uri) {
+    $this->getEffects()->resetRuntimeVariables();
     foreach ($this->getEffects() as $effect) {
       $effect->transformDimensions($dimensions, $uri);
     }
@@ -319,6 +321,7 @@ public function transformDimensions(array &$dimensions, $uri) {
    * {@inheritdoc}
    */
   public function getDerivativeExtension($extension) {
+    $this->getEffects()->resetRuntimeVariables();
     foreach ($this->getEffects() as $effect) {
       $extension = $effect->getDerivativeExtension($extension);
     }
diff --git a/core/modules/image/src/ImageEffectPluginCollection.php b/core/modules/image/src/ImageEffectPluginCollection.php
index db51f2d..ba4af43 100644
--- a/core/modules/image/src/ImageEffectPluginCollection.php
+++ b/core/modules/image/src/ImageEffectPluginCollection.php
@@ -7,12 +7,13 @@
 
 namespace Drupal\image;
 
+use Drupal\Core\KeyValueStore\MemoryStorage;
 use Drupal\Core\Plugin\DefaultLazyPluginCollection;
 
 /**
  * A collection of image effects.
  */
-class ImageEffectPluginCollection extends DefaultLazyPluginCollection {
+class ImageEffectPluginCollection extends DefaultLazyPluginCollection implements ImageEffectPluginCollectionInterface {
 
   /**
    * The unique ID of the image style using these effects.
@@ -22,6 +23,13 @@ class ImageEffectPluginCollection extends DefaultLazyPluginCollection {
   protected $imageStyleId;
 
   /**
+   * A pool of runtime variables for the image effects.
+   *
+   * @var \Drupal\Core\KeyValueStore\MemoryStorage
+   */
+  protected $runtimeVariables;
+
+  /**
    * Constructs a new ImageEffectPluginCollection object.
    *
    * @param \Drupal\image\ImageEffectManager $manager
@@ -35,6 +43,8 @@ class ImageEffectPluginCollection extends DefaultLazyPluginCollection {
   public function __construct(ImageEffectManager $manager, array $configurations, $image_style_id) {
     parent::__construct($manager, $configurations);
     $this->imageStyleId = $image_style_id;
+    $this->runtimeVariables = new MemoryStorage('runtime_variables');
+    $this->resetRuntimeVariables();
   }
 
   /**
@@ -54,7 +64,7 @@ protected function initializePlugin($instance_id) {
 
     $plugin_instance = $this->pluginInstances[$instance_id];
     if ($plugin_instance instanceof ImageStyleAwareInterface) {
-      $plugin_instance->setImageStyleId($this->imageStyleId);
+      $plugin_instance->setRuntimeVariables($this->runtimeVariables);
     }
   }
 
@@ -71,4 +81,20 @@ public function sortHelper($aID, $bID) {
     return ($a_weight < $b_weight) ? -1 : 1;
   }
 
+  /**
+   * {@inheritdoc}
+   */
+  public function getRuntimeVariables() {
+    return $this->runtimeVariables;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function resetRuntimeVariables() {
+    $this->runtimeVariables->deleteAll();
+    $this->runtimeVariables->set('image_style_id', $this->imageStyleId);
+    return $this;
+  }
+
 }
diff --git a/core/modules/image/src/ImageEffectPluginCollectionInterface.php b/core/modules/image/src/ImageEffectPluginCollectionInterface.php
new file mode 100644
index 0000000..546ec7e
--- /dev/null
+++ b/core/modules/image/src/ImageEffectPluginCollectionInterface.php
@@ -0,0 +1,37 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\image\ImageEffectPluginCollectionInterface.
+ */
+
+namespace Drupal\image;
+
+/**
+ * Provides an interface for a collection of image effects.
+ */
+interface ImageEffectPluginCollectionInterface {
+
+  /**
+   * Returns the pool of runtime variables for the image effects.
+   *
+   * @return \Drupal\Core\KeyValueStore\MemoryStorage
+   *   The pool of runtime variables for the image effects.
+   */
+  public function getRuntimeVariables();
+
+  /**
+   * Resets the pool of runtime variables for the image effects.
+   *
+   * The runtime variable 'image_style_id' will be set to the ID of the parent
+   * ImageStyleInterface object, and image effects will be able to call the
+   * ::getImageStyle method to retrieve a copy of the ImageStyle object to
+   * access its third party settings.
+   *
+   * @return $this
+   *
+   * @see \Drupal\image\ImageStyleAwareTrait::getImageStyle
+   */
+  public function resetRuntimeVariables();
+
+}
diff --git a/core/modules/image/src/ImageStyleAwareInterface.php b/core/modules/image/src/ImageStyleAwareInterface.php
index ab68270..d420bf0 100644
--- a/core/modules/image/src/ImageStyleAwareInterface.php
+++ b/core/modules/image/src/ImageStyleAwareInterface.php
@@ -13,13 +13,13 @@
 interface ImageStyleAwareInterface {
 
   /**
-   * Sets the unique ID for the image style the effect belongs to.
+   * Sets the the pool of runtime variables for the image effects.
    *
-   * @param string $image_style_id
-   *   The unique ID for the image style.
+   * @param \Drupal\Core\KeyValueStore\MemoryStorage $runtime_variables;
+   *   The pool of runtime variables for the image effects.
    *
    * @return $this
    */
-  public function setImageStyleId($image_style_id);
+  public function setRuntimeVariables($runtime_variables);
 
 }
diff --git a/core/modules/image/src/ImageStyleAwareTrait.php b/core/modules/image/src/ImageStyleAwareTrait.php
index 53c7c0d..8e22485 100644
--- a/core/modules/image/src/ImageStyleAwareTrait.php
+++ b/core/modules/image/src/ImageStyleAwareTrait.php
@@ -17,38 +17,52 @@
 trait ImageStyleAwareTrait {
 
   /**
-   * The unique ID image style this effect belongs to.
+   * The shared pool of runtime variables for the image effects.
    *
-   * @var string|null
+   * @var \Drupal\Core\KeyValueStore\MemoryStorage
    */
-  protected $imageStyleId;
+  protected $runtimeVariables;
 
   /**
-   * The image style this effect belongs to.
+   * Returns whether runtime variables are available.
    *
-   * @var \Drupal\image\ImageStyleInterface
+   * @return bool
+   *   TRUE if runtime variables are set, FALSE otherwise.
    */
-  protected $imageStyle;
+  protected function hasRuntimeVariables() {
+    return isset($this->runtimeVariables);
+  }
+
+  /**
+   * Returns the pool of runtime variables.
+   *
+   * @return \Drupal\Core\KeyValueStore\MemoryStorage|null
+   *   The runtime variables, or NULL if not set.
+   */
+  protected function getRuntimeVariables() {
+    return $this->runtimeVariables;
+  }
 
   /**
-   * Implements \Drupal\image\ImageStyleAwareInterface::setImageStyleId().
+   * Implements \Drupal\image\ImageStyleAwareInterface::setRuntimeVariables().
    */
-  public function setImageStyleId($image_style_id) {
-    $this->imageStyleId = $image_style_id;
+  public function setRuntimeVariables($runtime_variables) {
+    $this->runtimeVariables = $runtime_variables;
     return $this;
   }
 
   /**
    * Gets the image style object this effect belongs to.
    *
-   * @return \Drupal\image\ImageStyleInterface
-   *   The image style this effect belongs to.
+   * @return \Drupal\image\ImageStyleInterface|null
+   *   The image style this effect belongs to, or NULL if runtime variables are
+   *   not available.
    */
   protected function getImageStyle() {
-    if (!$this->imageStyle) {
-      $this->imageStyle = ImageStyle::load($this->imageStyleId);
+    if ($this->getRuntimeVariables() && $this->getRuntimeVariables()->has('image_style_id')) {
+      return ImageStyle::load($this->getRuntimeVariables()->get('image_style_id'));
     }
-    return $this->imageStyle;
+    return NULL;
   }
 
 }
diff --git a/core/modules/image/src/Tests/ImageAdminStylesTest.php b/core/modules/image/src/Tests/ImageAdminStylesTest.php
index 6c4f2cf..f2abd78 100644
--- a/core/modules/image/src/Tests/ImageAdminStylesTest.php
+++ b/core/modules/image/src/Tests/ImageAdminStylesTest.php
@@ -474,4 +474,35 @@ public function testImageStyleAccess() {
     $this->assertRaw(t('Select a new effect'));
   }
 
+  /**
+   * Tests image style runtime variables.
+   */
+  public function testImageStyleRuntimeVariables() {
+    // Create a test image style, with runtime variables aware image effect.
+    $style = ImageStyle::create(['name' => 'style_foo', 'label' => $this->randomString()]);
+    $effect = [
+      'id' => 'image_module_test_image_style_aware',
+      'data' => [],
+      'weight' => 2,
+    ];
+    $style->addImageEffect($effect);
+    $effect['weight'] = 4;
+    $style->addImageEffect($effect);
+    $style->save();
+
+    // Style ID should be in the runtime variables.
+    $this->assertEqual($style->id(), $style->getEffects()->getRuntimeVariables()->get('image_style_id'));
+
+    // Run through style transform dimensions and check runtime variable is
+    // set at the end.
+    $dimensions = [
+      'width' => 10,
+      'height' => 10,
+    ];
+    $style->transformDimensions($dimensions, NULL);
+    $this->assertEqual(20, $dimensions['width']);
+    $this->assertEqual($style->id(), $style->getEffects()->getRuntimeVariables()->get('image_style_id'));
+    $this->assertEqual(200, $style->getEffects()->getRuntimeVariables()->get('test_variable'));
+  }
+
 }
diff --git a/core/modules/image/tests/modules/image_module_test/src/Plugin/ImageEffect/ImageStyleAwareTestImageEffect.php b/core/modules/image/tests/modules/image_module_test/src/Plugin/ImageEffect/ImageStyleAwareTestImageEffect.php
index 1f38963..3638eed 100644
--- a/core/modules/image/tests/modules/image_module_test/src/Plugin/ImageEffect/ImageStyleAwareTestImageEffect.php
+++ b/core/modules/image/tests/modules/image_module_test/src/Plugin/ImageEffect/ImageStyleAwareTestImageEffect.php
@@ -28,7 +28,17 @@ class ImageStyleAwareTestImageEffect extends ImageEffectBase implements ImageSty
   /**
    * {@inheritdoc}
    */
+  public function transformDimensions(array &$dimensions, $uri) {
+    $dimensions['width'] = 20;
+    $dimensions['height'] = 20;
+    $this->setTestVariable();
+  }
+
+  /**
+   * {@inheritdoc}
+   */
   public function applyEffect(ImageInterface $image) {
+    $this->setTestVariable();
     return TRUE;
   }
 
@@ -39,4 +49,15 @@ public function label() {
     return $this->getImageStyle()->getThirdPartySetting('image_module_test', 'foo');
   }
 
+  /**
+   * Sets the runtime test variable.
+   */
+  protected function setTestVariable() {
+    if ($this->hasRuntimeVariables()) {
+      $test_variable = $this->getRuntimeVariables()->get('test_variable', 0);
+      $test_variable += 100;
+      $this->getRuntimeVariables()->set('test_variable', $test_variable);
+    }
+  }
+
 }