点击按钮显示滤镜处理后图片报_tkinter.TclError错误如何解决

报错原因 #

• Tkinter的Label组件的image参数仅支持PIL.ImageTk.PhotoImage类型的对象，你代码里直接传入了cv2.blur返回的numpy数组，格式不匹配。
• Tkinter不会主动保留PhotoImage对象的引用，如果你将PhotoImage定义为函数内的局部变量，函数执行完毕后对象会被垃圾回收，导致Label无法找到对应的图像资源，也会触发这个报错。

修复后的代码 #

from tkinter import *
import cv2
import numpy as np
from PIL import ImageTk,Image

root=Tk()
root.title("image processing")
original_image=ImageTk.PhotoImage(Image.open("E:/college materials/third year first term/image processing/section/noised_image.png"))
original_image_for_filter=cv2.imread("E:/college materials/third year first term/image processing/section/noised_image.png")

image_label=Label(image=original_image)
image_label.grid(row=0,column=0)

def button_Blur(): 
    filtered_image_cv = cv2.blur(original_image_for_filter,(5,5))
    # 转换cv2默认的BGR通道为PIL需要的RGB通道，避免颜色偏移
    filtered_image_rgb = cv2.cvtColor(filtered_image_cv, cv2.COLOR_BGR2RGB)
    # 把numpy数组转为PIL Image对象，再封装为Tkinter支持的PhotoImage
    filtered_image_pil = Image.fromarray(filtered_image_rgb)
    filtered_image = ImageTk.PhotoImage(filtered_image_pil)
    image_label_filtered=Label(image=filtered_image)
    # 手动绑定图像到Label属性，保留引用避免被垃圾回收
    image_label_filtered.image = filtered_image
    image_label_filtered.grid(row =0, column=1) 

button_blur=Button(root,text="apply blur filter",command=button_Blur)
button_blur.grid(row=1,column=0)
root.mainloop()

内容的提问来源于stack exchange，提问作者Aya Ibrahim