如何从kivy窗口获取像素颜色值

from kivy.app import App
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.label import Label
from kivy.core.window import Window

class ColorPickerApp(App):
    def build(self):
        layout = BoxLayout(orientation='vertical')
        label = Label(text='Click anywhere to get pixel color')
        layout.add_widget(label)

        Window.bind(mouse_pos=self.on_mouse_move)
        return layout

    def on_mouse_move(self, window, pos):
        if Window.mouse_pressed[0]:
            pixel_color = Window.get_pixel_color(*pos)
            print('Pixel color:', pixel_color)

ColorPickerApp().run()