pillow修改透明度在tkinter画布上显示

以下是绝大部分代码:

"""
    pillow修改透明度在tkinter画布上显示.py
"""
import time
from tkinter import *
from PIL import Image,ImageTk

def setalpha(rawim,a):
    pass
    
root = Tk()
root.title('pillow修改透明度在tkinter画布上显示by李兴球')

cv = Canvas(root,width=480,height=360,bg='white')
cv.pack()

bg = ImageTk.PhotoImage(file='c:/电影院外面.png')
cv.create_image(240,180,image=bg)

im = Image.open("c:/cat.gif")
im = im.convert('RGBA')
img = ImageTk.PhotoImage(im) 
cat= cv.create_image(240,220,image=img)

while 1:
    b = time.time()
    for a in range(255,-1,-10):
        im1 = setalpha(im,a)
        img = ImageTk.PhotoImage(im1)
        cv.itemconfig(cat,image=img)
        cv.update()
        time.sleep(0.01)
    print(time.time() - b)

    b = time.time()
    for a in range(0,256,10):
        im1 = setalpha(im,a)
        img = ImageTk.PhotoImage(im1)
        cv.itemconfig(cat,image=img)
        cv.update()
        time.sleep(0.01)
    print(time.time() - b)

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