How To Convert Imagetk To Image?

Let's say I have some ImageTk.PhotoImage image stored in the variable imgtk. How can I convert it back to an Image.Image? The reason is that I want to resize it, but it seems that

Solution 1:

Ok, that was not easy but I think I have a solution though you need to go into some private methods of label.image. Maybe there is a better way if so I would love to see.

import tkinter as tk
from tkinter import Label
import numpy as np
from PIL import Image, ImageTk

root = tk.Tk()

# create label1 with an image
image = Image.open('pic1.jpg')
image = image.resize((500, 750), Image.ANTIALIAS)
picture = ImageTk.PhotoImage(image=image)
label1 = Label(root, image=picture)
label1.image = picture

# extract rgb from image of label1
width, height = label1.image._PhotoImage__size
rgb = np.empty((height, width, 3))
for j inrange(height):
    for i inrange(width):
        rgb[j, i, :] = label1.image._PhotoImage__photo.get(x=i, y=j)

# create new image from rgb, resize and use for label2
new_image = Image.fromarray(rgb.astype('uint8'))
new_image = new_image.resize((250, 300), Image.ANTIALIAS)
picture2 = ImageTk.PhotoImage(image=new_image)
label2 = Label(root, image=picture2)
label2.image = picture2

# grid the two labels
label1.grid(row=0, column=0)
label2.grid(row=0, column=1)

root.mainloop()

Actually you can zoom and reduce the original picture by using the methods zoom to enlarge the picture (zoom(2) doubles the size) and subsample to reduce the size (subsample(2) halves the picture size).

for example

picture2 = label1.image._PhotoImage__photo.subsample(4)

reduces the size of the picture to a quarter and you can skip all the conversion to an Image.

According to label1.image._PhotoImage__photo.subsample.__doc__:

Return a new PhotoImage based on the same image as this widget but use only every Xth or Yth pixel. If y is not given, the default value is the same as x

and label1.image._PhotoImage__photo.zoom.__doc__:

Return a new PhotoImage with the same image as this widget but zoom it with a factor of x in the X direction and y in the Y direction. If y is not given, the default value is the same as x.

Solution 2:

I know it is awfully late, but I just came across the same issue and I just discovered that there is a getimage(imagetk) function in the ImageTk interface.

So, to get your imgtk back as an PIL Image you can do:

img = ImageTk.getimage( imgtk )

I just did a quick test on Windows (Python 3.8.5/Pillow 8.1.2/Tkinter 8.6) and it seems to work fine:

# imgtk is an ImageTk.PhotoImage object
img = ImageTk.getimage( imgtk )
img.show()
img.close()