Refreshing a GtkImage

[Steven Daniel Webb <webbsd cs curtin edu au>]

Hi,

I've used:

gtk_image_get_pixbuf()
gtk_pixbuf_get_pixels()

to get the pixels of an image.  Modified them.  Now I want the GtkImage 
to reflect the new pixel values.  How do I update the GtkImage?

I've tried gdk_flush() but it didn't have any effect.

Thanks.

Steve.