[pygtk] How to change the alpha (opacity or transparency）of an image?

[李志]

Hi, everyone. 
How can I to change the alpha of an image? The code sample is as follows.






import pygtk
pygtk.require('2.0')
import gtk


class ImagesExample:
    # when invoked (via signal delete_event), terminates the application.
    def close_application(self, widget, event, data=None):
        gtk.main_quit()
        return False


    def __init__(self):
        # create the main window, and attach delete_event signal to terminating
        # the application
        window = gtk.Window(gtk.WINDOW_TOPLEVEL)
        window.connect("delete_event", self.close_application)
        window.set_border_width(10)
        window.show()


        # a horizontal box to hold the buttons
        hbox = gtk.HBox()
        hbox.show()
        window.add(hbox)


        pixbuf = gtk.gdk.pixbuf_new_from_file("Button-Last-72x72.png")
        print pixbuf.get_n_channels()
        print pixbuf.get_has_alpha()
        image = gtk.Image()
        image.set_from_pixbuf(pixbuf)
        image.show()
        print image.get_window()
        hbox.pack_start(image)


def main():
    gtk.main()
    return 0


if __name__ == "__main__":
    ImagesExample()
    main()
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