diff -Nur celestia-1.6.0.orig/src/celengine/image.cpp celestia-1.6.0/src/celengine/image.cpp
--- celestia-1.6.0.orig/src/celengine/image.cpp	2009-06-22 18:44:08.000000000 +0300
+++ celestia-1.6.0/src/celengine/image.cpp	2010-01-18 23:27:55.000000000 +0200
@@ -737,7 +737,7 @@
 
     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);
     }
 
     if (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS))