core/modules/image/src/ImageEffectBase.php                          | 4 +++-
 core/modules/image/src/Plugin/ImageEffect/ConvertImageEffect.php    | 6 ------
 core/modules/image/src/Plugin/ImageEffect/DesaturateImageEffect.php | 6 ------
 core/modules/image/src/Plugin/ImageEffect/RotateImageEffect.php     | 1 +
 4 files changed, 4 insertions(+), 13 deletions(-)

diff --git a/core/modules/image/src/ImageEffectBase.php b/core/modules/image/src/ImageEffectBase.php
index 3b3bbb7..d0ef256 100644
--- a/core/modules/image/src/ImageEffectBase.php
+++ b/core/modules/image/src/ImageEffectBase.php
@@ -71,7 +71,9 @@ public static function create(ContainerInterface $container, array $configuratio
    * {@inheritdoc}
    */
   public function transformDimensions(array &$dimensions) {
-    $dimensions['width'] = $dimensions['height'] = NULL;
+    // Most image effects will not change the dimensions. This base
+    // implementation represents this behavior. Override this method if your
+    // image effect does change the dimensions.
   }
 
   /**
diff --git a/core/modules/image/src/Plugin/ImageEffect/ConvertImageEffect.php b/core/modules/image/src/Plugin/ImageEffect/ConvertImageEffect.php
index d88712c..8d78514 100644
--- a/core/modules/image/src/Plugin/ImageEffect/ConvertImageEffect.php
+++ b/core/modules/image/src/Plugin/ImageEffect/ConvertImageEffect.php
@@ -26,12 +26,6 @@ class ConvertImageEffect extends ConfigurableImageEffectBase {
   /**
    * {@inheritdoc}
    */
-  public function transformDimensions(array &$dimensions) {
-  }
-
-  /**
-   * {@inheritdoc}
-   */
   public function applyEffect(ImageInterface $image) {
     if (!$image->convert($this->configuration['extension'])) {
       $this->logger->error('Image convert failed using the %toolkit toolkit on %path (%mimetype)', array('%toolkit' => $image->getToolkitId(), '%path' => $image->getSource(), '%mimetype' => $image->getMimeType()));
diff --git a/core/modules/image/src/Plugin/ImageEffect/DesaturateImageEffect.php b/core/modules/image/src/Plugin/ImageEffect/DesaturateImageEffect.php
index 97d31d8..008f6a8 100644
--- a/core/modules/image/src/Plugin/ImageEffect/DesaturateImageEffect.php
+++ b/core/modules/image/src/Plugin/ImageEffect/DesaturateImageEffect.php
@@ -24,12 +24,6 @@ class DesaturateImageEffect extends ImageEffectBase {
   /**
    * {@inheritdoc}
    */
-  public function transformDimensions(array &$dimensions) {
-  }
-
-  /**
-   * {@inheritdoc}
-   */
   public function applyEffect(ImageInterface $image) {
     if (!$image->desaturate()) {
       $this->logger->error('Image desaturate failed using the %toolkit toolkit on %path (%mimetype, %dimensions)', array('%toolkit' => $image->getToolkitId(), '%path' => $image->getSource(), '%mimetype' => $image->getMimeType(), '%dimensions' => $image->getWidth() . 'x' . $image->getHeight()));
diff --git a/core/modules/image/src/Plugin/ImageEffect/RotateImageEffect.php b/core/modules/image/src/Plugin/ImageEffect/RotateImageEffect.php
index 9964886..678689a 100644
--- a/core/modules/image/src/Plugin/ImageEffect/RotateImageEffect.php
+++ b/core/modules/image/src/Plugin/ImageEffect/RotateImageEffect.php
@@ -52,6 +52,7 @@ public function transformDimensions(array &$dimensions) {
         $dimensions['height'] = $temp;
       }
     }
+    // The rotation is random, hence we cannot determine the new dimensions.
     else {
       $dimensions['width'] = $dimensions['height'] = NULL;
     }