def rgb_gray_blend():
frame = wx.Frame(None, title='blend')
canvas = Canvas(frame, autofit=True)
canvas.set_img(astronaut())
canvas.set_cn((0, 1, 2))
canvas.set_img(camera(), True)
canvas.set_cn(0, True)
canvas.set_mode(0.5)
frame.Show()
def rgb_test():
frame = wx.Frame(None, title='gray test')
canvas = Canvas(frame, autofit=True)
canvas.set_img(astronaut())
canvas.set_cn((0, 1, 2))
frame.Show()
