Index: wp-admin/includes/media.php
===================================================================
--- wp-admin/includes/media.php	(revision 21358)
+++ wp-admin/includes/media.php	(working copy)
@@ -1369,8 +1369,20 @@
 $large_size_w = absint( get_option('large_size_w') );
 if( !$large_size_w )
 	$large_size_w = 1024;
+
+$dimensions = $args = '';
+
+	$dimensions = array(
+		'height' => $large_size_h,
+		'width' => $large_size_w
+	);
+	
+	$args = apply_filters( 'resize_upload_dimensions', $args );
+	
+	extract( wp_parse_args( $args, $dimensions ) );
 ?>
-var resize_height = <?php echo $large_size_h; ?>, resize_width = <?php echo $large_size_w; ?>,
+
+var resize_height = <?php echo $height; ?>, resize_width = <?php echo $width; ?>,
 wpUploaderInit = <?php echo json_encode($plupload_init); ?>;
 </script>