diff -ur VTK//IO/vtkPNGReader.cxx VTK.new//IO/vtkPNGReader.cxx
--- VTK//IO/vtkPNGReader.cxx	2010-09-28 02:10:05.000000000 +0530
+++ VTK.new//IO/vtkPNGReader.cxx	2011-03-24 00:28:48.102001081 +0530
@@ -115,7 +115,7 @@
   // minimum of a byte per pixel
   if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth < 8) 
     {
-    png_set_gray_1_2_4_to_8(png_ptr);
+    png_set_expand_gray_1_2_4_to_8(png_ptr);
     }
 
   // add alpha if any alpha found
@@ -224,7 +224,7 @@
   // minimum of a byte per pixel
   if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth < 8) 
     {
-    png_set_gray_1_2_4_to_8(png_ptr);
+    png_set_expand_gray_1_2_4_to_8(png_ptr);
     }
 
   // add alpha if any alpha found