如何在Tkinter中覆盖图像

import tkinter as tk
from PIL import ImageTk, Image

root = tk.Tk()
canvas = tk.Canvas(root, width=500, height=500)
canvas.pack()

image = Image.open("image.jpg")
image = image.resize((500, 500), Image.ANTIALIAS)  # 调整图像大小以适应画布
image_tk = ImageTk.PhotoImage(image)
canvas.create_image(0, 0, anchor=tk.NW, image=image_tk)

def overlay_image():
    overlay = Image.open("overlay.png")
    overlay = overlay.resize((500, 500), Image.ANTIALIAS)
    overlay_tk = ImageTk.PhotoImage(overlay)
    canvas.create_image(0, 0, anchor=tk.NW, image=overlay_tk)

overlay_button = tk.Button(root, text="覆盖图像", command=overlay_image)
overlay_button.pack()

root.mainloop()