TypeError: an integer is required (got type str) when using image.resize()-CodePudding

I want to use the slider widget to zoom an image in small ranges using float values. I have created the slider and function to zoom the image as below however I get the error "TypeError: an integer is required (got type str)". Any suggestions to get this fixed are welcomed.

def showImage():
    img = Image.open('image.png')
    img = ImageTk.PhotoImage(img.resize((260, 220), Image.ANTIALIAS))
    img_label = Label(frame1, image=img)
    img_label.image = img
    return img

## function to zoom the image ##
def zoom_img(zoom):
    showImage()
    newsize = (img.size[0]*zoom, 
                img.size[1]*zoom)
    scaledImg = img.resize(newsize, Image.NEAREST)
    newImg = ImageTk.PhotoImage(scaledImg)
    img_label.configure(image=newImg)

## scaler widget ##
var = StringVar()
zoom_scale = tk.Scale(root, variable=var, orient='horizontal', from_=220.0, to=440.0, length=100, resolution=20.0, command=zoom_img)

zoom_scale.place(x=1600, y=160)

## Error generated ###
File "C:\ProgramData\Anaconda3\lib\tkinter\__init__.py", line 1705, in __call__
    return self.func(*args)
  File "c:/Users/DANIEL/Desktop/exp/fcnvmb/butt.py", line 218, in zoom_img
    scaledImg = img.resize(newsize, Image.NEAREST)
  File "C:\ProgramData\Anaconda3\lib\site-packages\PIL\Image.py", line 1780, in resize
    return self.convert('RGBa').resize(size, resample, box).convert('RGBA')
  File "C:\ProgramData\Anaconda3\lib\site-packages\PIL\Image.py", line 1784, in resize
    return self._new(self.im.resize(size, resample, box))
TypeError: an integer is required (got type str)

CodePudding user response：

The value that gets passed to the tk.Scale command callback is a string. You need to convert it to a float.

def zoom_img(zoom):
    zoom = float(zoom)
    ...

Followup

OK, here's a version that seems to work. I assume you want to keep the image window a constant size, which means you'll also need panning. I've filled in some details you omitted, but this should just cut-and-paste run, once you substitute your image file name.

from tkinter import *
from PIL import Image, ImageTk

def showImage():
    img = Image.open('7460.PNG')
    img = ImageTk.PhotoImage(img.resize((260, 220), Image.ANTIALIAS))
    img_label = Label(root, image=img)
    img_label.image = img
    img_label.pack()
    return img_label

## function to zoom the image ##
def zoom_img(zoom):
    global newImg
    img = Image.open('7460.PNG')
    newsize = (img.size[0]*int(zoom), img.size[1]*int(zoom))
    scaledImg = img.resize(newsize, Image.NEAREST)
    newImg = ImageTk.PhotoImage(scaledImg)
    img_label.configure(image=newImg, width=260,height=220)

root = Tk()

## scaler widget ##
var = StringVar()
zoom_scale = Scale(root, variable=var, orient='horizontal', from_=1, to=20, length=100, resolution=1, command=zoom_img)
img_label = showImage()
zoom_scale.pack()

root.mainloop()