--- src/main-win.c.orig	2008-10-04 17:34:57.384391699 +0800
+++ src/main-win.c	2008-10-04 17:31:39.611077556 +0800
@@ -149,7 +149,13 @@
 
     GtkWidget* box = gtk_vbox_new( FALSE, 0 );
     gtk_container_add( (GtkContainer*)mw, box);
-
+/*	Set rgba colormap	*/
+    GdkScreen *screen = gtk_widget_get_screen((GtkWindow*)mw);
+    GdkColormap *colormap = gdk_screen_get_rgba_colormap (screen);
+    if (colormap && gdk_screen_is_composited (screen)){
+        gtk_widget_set_default_colormap(colormap);
+    }
+/*	End set rgba colormap	*/
     // image area
     mw->evt_box = gtk_event_box_new();
     GTK_WIDGET_SET_FLAGS( mw->evt_box, GTK_CAN_FOCUS );