Index: trunk/src_plugins/export_png/png.c
===================================================================
--- trunk/src_plugins/export_png/png.c	(revision 27044)
+++ trunk/src_plugins/export_png/png.c	(revision 27045)
@@ -1451,7 +1451,7 @@
 	}
 	gc->is_erase = 0;
 
-	if (in_mono || (strcmp(color->str, "#000000") == 0)) {
+	if (in_mono || (color->packed == 0)) {
 		gc->color = black;
 		return;
 	}