我只是想做一个程序，点击一个图像，并查看它在全屏.我使用Visual Studio 2022.我的环境是Python 3.9（64位）.枕头（9.4.0）安装在环境中.我在Windows 11.这里是完整的代码：

import tkinter as tk
from tkinter import filedialog
from PIL import Image, ImageTk
import os

def main():
    image_path = filedialog.askopenfilename(title="Select Image")
    root = tk.Tk()
    root.attributes('-fullscreen', True)
    canvas = tk.Canvas(root, bg="black")
    canvas.pack(fill=tk.BOTH, expand=True)
    pil_image = Image.open(image_path)
    pil_image = pil_image.resize((root.winfo_screenwidth(), root.winfo_screenheight()), Image.LANCZOS)
    tk_image = ImageTk.PhotoImage(pil_image)
    canvas.create_image(root.winfo_screenwidth() // 2, root.winfo_screenheight() // 2, image=tk_image)
    root.mainloop()

if __name__ == '__main__':
    main()

这段代码在我运行它并选择了一个图像之后抛出了一个image "pyimage1" doesn't exist异常。我可能做错了什么呢？