Question

我是python的初学者所以这可能是一个太简单的问题，但我需要帮助..有了这段代码，我无法更新tkinter标签中的图像。我甚至可以根据新加载的图像属性调整窗口大小，但新图像不会显示在tkinter标签中。

from Tkinter import Frame, Tk, Label, Text, Menu, END, BOTH, StringVar
from PIL import ImageTk, Image
import numpy
import tkFileDialog

class DIP(Frame):
    def __init__(self, parent):
        Frame.__init__(self, parent) 
        self.parent = parent        
        self.initUI()

def initUI(self):

    self.parent.title("DIP Algorithms- Simple Photo Editor")
    self.pack(fill=BOTH, expand=1)

    menubar = Menu(self.parent)
    self.parent.config(menu=menubar)

    #Open Image Menu
    fileMenu = Menu(menubar)
    fileMenu.add_command(label="Open", command=self.onOpen)
    menubar.add_cascade(label="File", menu=fileMenu)

    #menu for image ngative
    basicMenu=Menu(menubar)
    basicMenu.add_command(label="Negative", command=self.onNeg)
    menubar.add_cascade(label="Basic", menu=basicMenu)

#Image Negative Menu callback
def onNeg(self):
    I2=255-self.I;
    im = Image.fromarray(numpy.uint8(I2))
    photo2=ImageTk.PhotoImage(im)
    self.label2= Label(self.parent,border=25,image=photo2)
    self.label2.image = photo2 # keep a reference!
    self.label2.grid(row=1, column=2)


def setImage(self):

    self.img=Image.open(self.fn)
    self.I = numpy.asarray(self.img)
    l,h = self.img.size
    text=str(2*l+100)+"x"+str(h+50)+"+0+0"
    self.parent.geometry(text)
    photo = ImageTk.PhotoImage(self.img)
    self.label1 = Label(self.parent,border=25,image=photo)
    self.label1.configure(image=photo)
    self.label1.image = photo # keep a reference!
    self.label1.grid(row=1, column=1)

#Open Callback
def onOpen(self):

    ftypes = [('Image Files', '*.tif *.jpg *.png')]
    dlg = tkFileDialog.Open(self, filetypes = ftypes)
    filename = dlg.show()
    self.fn=filename
    #print self.fn #prints filename with path here
    self.setImage()

#def onError(self):
    #box.showerror("Error", "Could not open file")    

def main():

    root = Tk()
    DIP(root)
    root.geometry("320x240")
    root.mainloop()  


if __name__ == '__main__':
    main()

当我运行此代码并打开图像时，它将显示在label1中。但是，当我再次打开另一个图像时，我希望它显示在同一个label1中，但它没有发生。我知道第二个图像已加载，因为窗口大小相应调整，唯一的问题是它没有显示，我无法弄清楚为什么！

Answer 1

每次调用tk.Label时都不会创建新的setImage，只需在setImage之外创建一次，例如initUI。

然后，您可以致电self.label.configure：

来更改图片

import Tkinter as tk
import Image
import ImageTk
import numpy as np
import tkFileDialog

class DIP(tk.Frame):
    def __init__(self, parent):
        tk.Frame.__init__(self, parent) 
        self.parent = parent        
        self.initUI()

    def initUI(self):
        self.parent.title("DIP Algorithms- Simple Photo Editor")
        self.pack(fill = tk.BOTH, expand = 1)

        menubar = tk.Menu(self.parent)
        self.parent.config(menu = menubar)

        self.label1 = tk.Label(self, border = 25)
        self.label2 = tk.Label(self, border = 25)
        self.label1.grid(row = 1, column = 1)
        self.label2.grid(row = 1, column = 2)

        #Open Image Menu
        fileMenu = tk.Menu(menubar)
        fileMenu.add_command(label = "Open", command = self.onOpen)
        menubar.add_cascade(label = "File", menu = fileMenu)

        #menu for image ngative
        basicMenu = tk.Menu(menubar)
        basicMenu.add_command(label = "Negative", command = self.onNeg)
        menubar.add_cascade(label = "Basic", menu = basicMenu)

    def onNeg(self):
        #Image Negative Menu callback
        I2 = 255-self.I;
        im = Image.fromarray(np.uint8(I2))
        photo2 = ImageTk.PhotoImage(im)
        self.label2.image = photo2 # keep a reference!

    def setImage(self):
        self.img = Image.open(self.fn)
        self.I = np.asarray(self.img)
        l, h = self.img.size
        text = str(2*l+100)+"x"+str(h+50)+"+0+0"
        self.parent.geometry(text)
        photo = ImageTk.PhotoImage(self.img)
        self.label1.configure(image = photo)
        self.label1.image = photo # keep a reference!

    def onOpen(self):
        #Open Callback
        ftypes = [('Image Files', '*.tif *.jpg *.png')]
        dlg = tkFileDialog.Open(self, filetypes = ftypes)
        filename = dlg.show()
        self.fn = filename
        #print self.fn #prints filename with path here
        self.setImage()

    #def onError(self):
        #box.showerror("Error", "Could not open file")    

def main():

    root = tk.Tk()
    DIP(root)
    root.geometry("320x240")
    root.mainloop()  


if __name__ == '__main__':
    main()

如何在tkinter标签中更新图像？

1 个答案: