import tkinter as tk
from tkinter import filedialog
from tkinter import messagebox
from PIL import Image

root = tk.Tk()
canvas1 = tk.Canvas(root, width=300, height=250, bg='gray', relief = 'raised')
canvas1.pack()

label1 = tk.Label(root, text='PNG to JPG Tool', bg='gray')
label1.config(font=('helvetica', 20))
canvas1.create_window(150,60,window=label1)


def getPNG():
    global im1
    import_file_path = filedialog.askopenfilename()
    im1 = Image.open(import_file_path).convert('RGB')

browseButton_PNG = tk.Button(text="   Import PNG file  ", command=getPNG)
canvas1.create_window(150,130,window=browseButton_PNG)

def convertToJPG():
    global im1

    export_file_path = filedialog.asksaveasfilename(defaultextension='.jpg')
    im1.save(export_file_path)

saveAsButton_JPG = tk.Button(text='Convert PNG to JPG', command=convertToJPG)
canvas1.create_window(150, 180, window=saveAsButton_JPG)

root.mainloop()