diff -u b/src/Plugin/diff/Field/ImageFieldBuilder.php b/src/Plugin/diff/Field/ImageFieldBuilder.php
--- b/src/Plugin/diff/Field/ImageFieldBuilder.php
+++ b/src/Plugin/diff/Field/ImageFieldBuilder.php
@@ -113,8 +113,8 @@
 
     $form['image_metadata'] = [
       '#type' => 'checkbox',
-      '#title' => $this->t('Compare extra image data'),
-      '#default_value' => $this->configuration['extra_image_data'],
+      '#title' => $this->t('Compare image metadata'),
+      '#default_value' => $this->configuration['image_metadata'],
       '#description' => $this->t('Compare image data such as file size, MIME type, width and height.'),
     ];