python，在tkinter中显示图像的函数? [英] python, function that shows image in tkinter?

问题描述

我想创建一个 tkinter 窗口并显示 lena 图片.我有一个有效的代码，但我不知道如何利用它来制作一个功能.

i want to create a tkinter window and display the lena picture. I got a code that is working but i dont know how to make a function out of it.

代码:

import numpy
import cv2
from Tkinter import *
from PIL import Image, ImageTk
import scipy.misc

#create root window
root = Tk()
root.geometry("600x600")

#path to lena picture
lena = "C:\lena.jpg"

##------------this as function----------------------------
#convert lena.jpg into tkinter photo image
image = Image.open(lena)
photo = ImageTk.PhotoImage(image)

#create canvas to display picture
w = Canvas(root)
w.create_image(0, 0, image = photo, anchor = "nw")
w.pack(fill = BOTH, expand = YES)
##-------end:-this as function----------------------------


#start root window
root.mainloop()

我试过这个功能，但是没有打开lena的图片...:

I tried this function but it didnt open the lena picture...:

#create root window
root = Tk()
root.geometry("600x600")

#path to lena picture
lena = "C:\lena.jpg"


def imgShow(img):
    ##------------this as function----------------------------
    #convert lena.jpg into tkinter photo image
    image = Image.open(img)
    photo = ImageTk.PhotoImage(image)

    #create canvas to display picture
    w = Canvas(root)
    w.create_image(0, 0, image = photo, anchor = "nw")
    w.pack(fill = BOTH, expand = YES)
    ##-------end:-this as function----------------------------

##use function with lena image path.
## doesnt work: window pops up but lena image is not shown
imgShow(lena)

#start root window
root.mainloop()

## ErrorMessages?: No Error Message 

你知道我做错了什么吗?

Do you know what i am doing wrong?

推荐答案

PhotoImage 分配给函数中的局部变量存在众所周知的问题.Garbage Collector 在您离开函数时移除图像，但您可以像这样将 photo(例如)分配给 w:

There is well known problem with PhotoImage assigned to local variable in function. Garbage Collector remove image when you leave function but you can assign photo (for example) to w like this:

photo = ImageTk.PhotoImage(image)

w = Canvas(root)
w.photo = photo # assign photo to object.

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