diff -u b/core/modules/image/image.field.inc b/core/modules/image/image.field.inc
--- b/core/modules/image/image.field.inc
+++ b/core/modules/image/image.field.inc
@@ -363,26 +363,23 @@
     );
   }
 
-  // The following code dealing with limit validation errors is the logic that
-  // avoids triggering error messages on elements that are accompanying the
-  // field element. These are alt and title elements. The idea is to dynamically
-  // build the definition of which fields should not be validated.
+  // Verify if alt and title elements are present & then dynamically build the
+  // definition of which fields should not be validated.
   if ($settings['alt_field_required'] || $settings['title_field_required']) {
     // Set helper container for collecting limit_validation_errors definitions.
     if (!isset($form_state['_limit_validation_errors'])) {
       $form_state['_limit_validation_errors'] = array();
     }
 
-    // In case the triggering element is not set - form is being rendered - or in
-    // case the rendering element is "Upload" - user uploaded new file - build
-    // the limit validation error array.
+    // Build the limit validation error array if the triggering element is not 
+    // set or for rendering the Upload element for a new file.
     if (!isset($form_state['triggering_element']) || $form_state['triggering_element']['#value'] == t('Upload')) {
-      // For files that have just been uploaded validate only the fid.
+      // For files that have just been uploaded validate only the file ID.
       if (empty($element['#file']) || empty($element['#file']->status)) {
         $form_state['_limit_validation_errors'][$element['#delta']] = array($instance['field_name'], $element['#language'], $element['#delta'], 'fid');
 
-        // Here we need to set the alt and title values from POST as the limit
-        // validation logic will remove them from form_state.
+        // Set alt and title values from POST as the limit validation logic will 
+        // remove them from the form_state.
         if ($element['#alt_field'] && isset($_POST[$instance['field_name']][$element['#language']][$element['#delta']]['alt'])) {
           $item['alt'] = $_POST[$instance['field_name']][$element['#language']][$element['#delta']]['alt'];
         }
@@ -390,14 +387,13 @@
           $item['title'] = $_POST[$instance['field_name']][$element['#language']][$element['#delta']]['title'];
         }
       }
-      // Previously uploaded files - validate whole field.
+      // Validate the whole field for previously uploaded files.
       else {
         $form_state['_limit_validation_errors'][$element['#delta']] = array($instance['field_name'], $element['#language'], $element['#delta']);
       }
     }
 
-    // Set the built limit validation error definition array for upload as well as
-    // for the remove button.
+    // Limit validation errors for the upload and remove buttons.
     $element['upload_button']['#limit_validation_errors'] = $form_state['_limit_validation_errors'];
     $element['remove_button']['#limit_validation_errors'] = $form_state['_limit_validation_errors'];
   }