image.thumbnail(width, height) not working

[PCesarano]

Good afternoon. My code, and the errors it throws, seem very basic, but I am following all of the instructions to use the thumbnail function that I can find and I'm still getting errors. I've isolated the problematic line, starting with "smallerimage", in the code snippet below. Each image currimage is large ~(3000 x 4000 pixels). My window, however, is always fixed at 800x480. The idea is to take the larger image, and use thumbnail to resize it while keeping the original aspect ratio. However, I keep getting the (abbreviated) error "TypeError: 'int' object is not iterable". The full error, followed by the full code, and given after the code snippet. Thanks in advance.

Code snippet:

def GetNewImage():
    index = random.randint(0, 840)
    imgstring = "Images/" + str(file_list[index])
    currimage = Image.open(imgstring)

    smallerimage = currimage.thumbnail(800, 480)

    newimg = ImageTk.PhotoImage(smallerimage)
    image_layer.configure(image=newimg)
    image_layer.image = newimg
    image_layer.update()
    refresh()
    return newimg, currimage

Program errors:

"C:\Users\Patrick Cesarano\PycharmProjects\GUITutorial\venv\Scripts\python.exe" "C:/Users/Patrick Cesarano/PycharmProjects/GUITutorial/GuiTutorial_experimental.py"
Traceback (most recent call last):
File "C:\Users\Patrick Cesarano\PycharmProjects\GUITutorial\GuiTutorial_experimental.py", line 92, in <module>
mousecall()
File "C:\Users\Patrick Cesarano\PycharmProjects\GUITutorial\GuiTutorial_experimental.py", line 68, in mousecall
A = GetNewImage()
File "C:\Users\Patrick Cesarano\PycharmProjects\GUITutorial\GuiTutorial_experimental.py", line 50, in GetNewImage
smallerimage = currimage.thumbnail(800, 480)
File "C:\Users\Patrick Cesarano\PycharmProjects\GUITutorial\venv\lib\site-packages\PIL\Image.py", line 2320, in thumbnail
x, y = map(math.floor, size)
TypeError: 'int' object is not iterable

Process finished with exit code 1

Full code:

import tkinter as tk
import tkinter.font as font
import PIL
from PIL import ImageTk
from PIL import Image
import time
import os
import random

HEIGHT = 480
WIDTH = 800
file_list = os.listdir(r"Images")
file_number = len(file_list)

root = tk.Tk()
root.overrideredirect(True)  # removes title bar

canvas = tk.Canvas(root, height=HEIGHT, width=WIDTH)
canvas.pack()

frame = tk.Frame(canvas, height=HEIGHT, width=WIDTH)
frame.place(relwidth=1, relheight=1)

image_layer = tk.Label(frame)
image_layer.place(relwidth=1, relheight=1)

button_rotateleft = tk.Button(image_layer, text=u"\u21B6", command=lambda: RotateImageLt(''))
button_rotateleft.place(relx=0.015, rely=0.93)
button_rotateright = tk.Button(image_layer, text=u"\u21B7")
button_rotateright.place(relx=0.047, rely=0.93)

button_incrementright = tk.Button(image_layer, text=u"\u2190")
button_incrementright.place(relx=0.96, rely=0.93)
button_incrementleft = tk.Button(image_layer, text=u"\u2192")
button_incrementleft.place(relx=0.93, rely=0.93)

button_exit = tk.Button(image_layer, text="\u2716", command=root.quit)
button_exit.place(relx=0.965, rely=0.01)

button_newpicture = tk.Button(image_layer, text=u"\u2764", command=lambda: mousecall())
button_newpicture['font'] = font.Font(size=16)
button_newpicture.place(relx=0.015, rely=0.835, relwidth=0.061)


def GetNewImage():
    index = random.randint(0, 840)
    imgstring = "Images/" + str(file_list[index])
    currimage = Image.open(imgstring)

    smallerimage = currimage.thumbnail(800, 480)

    newimg = ImageTk.PhotoImage(smallerimage)
    image_layer.configure(image=newimg)
    image_layer.image = newimg
    image_layer.update()
    refresh()
    return newimg, currimage


def resizeimage(largeimage):
    pass


def mousecall():
    A = GetNewImage()
    refresh()


def refresh():
    canvas.update()
    frame.update()
    image_layer.update()
    button_newpicture.flash()
    button_rotateright.flash()
    button_rotateleft.flash()
    button_exit.flash()
    button_incrementleft.flash()
    button_incrementright.flash()


def RotateImageLt(redimage):
    imaget = redimage.rotate(270)
    image_layer.configure(image=imaget)
    image_layer.image = imaget
    image_layer.update()
    refresh()


mousecall()

root.mainloop()

[BashBedlam]

I cannot get ImageTk to work correctly on my system so I can't be 100% certain, but I think that your problem is in line 50. The width and height should be a tuple like this:

smallerimage = currimage.thumbnail((800, 480))

Note the double sets of parenthesis.

[PCesarano]

That was it! Bravo! Thank you.

Patrick