Index: branches/RC/core/units/general/helpers/image_helper.php
===================================================================
diff -u -N -r9176 -r9252
--- branches/RC/core/units/general/helpers/image_helper.php	(.../image_helper.php)	(revision 9176)
+++ branches/RC/core/units/general/helpers/image_helper.php	(.../image_helper.php)	(revision 9252)
@@ -113,6 +113,49 @@
 		}
 
 		/**
+		 * Returns maximal image size (width & height) among fields specified
+		 *
+		 * @param kDBItem $object
+		 * @param string $fields
+		 * @param string $format any format, that returns full url (e.g. files_resized:WxH, resize:WxH, full_url, full_urls)
+		 * @return string
+		 */
+		function MaxImageSize(&$object, $fields, $format = null)
+		{
+			static $cached_sizes = Array ();
+
+			$cache_key = $object->getPrefixSpecial().'_'.$object->GetID();
+			if (!isset($cached_sizes[$cache_key])) {
+				$images = Array ();
+
+				$fields = explode(',', $fields);
+				foreach ($fields as $field) {
+					$image_data = $object->GetField($field, $format);
+					if (!$image_data) {
+						continue;
+					}
+
+					$images = array_merge($images, explode('|', $image_data));
+				}
+
+				$max_width = 0;
+				$max_height = 0;
+				$base_url = rtrim($this->Application->BaseURL(), '/');
+
+				foreach ($images as $image_url) {
+					$image_path = preg_replace('/^'.preg_quote($base_url, '/').'(.*)/', FULL_PATH.'\\1', $image_url);
+					$image_info = $this->getImageInfo($image_path);
+					$max_width = max($max_width, $image_info[0]);
+					$max_height = max($max_height, $image_info[1]);
+				}
+
+				$cached_sizes[$cache_key] = Array ($max_width, $max_height);
+			}
+
+			return $cached_sizes[$cache_key];
+		}
+
+		/**
 		 * Determines what image fields should be created (from post or just dummy fields for 1st upload)
 		 *
 		 * @param string $prefix