PNG to ICO Converter

UI Convert Code:

import tkinter as tk
from PIL import Image
# By pillalamarri.in ### http://www.pillalamarri.in/python/png-to-ico-converter/
# Initialize Tkinter window
root = tk.Tk()
# Initialize variable to store image path
img = None
# Initialize font, background color, foreground color and width for the buttons
font = ('helvetica', 12, 'bold')
bg = 'blue'
fg = 'white'
width = 15

def getPNG():
    '''Function to get png image location and open it with pillow'''
    global img
    import_file_path = tk.filedialog.askopenfilename(filetypes=[("PNG File",'.png')])
    img = Image.open(import_file_path)

def convertToICO():
    global img
    '''Function to convert image from png to ico format with pillow and save to user specified location'''
    if img is None:
        tk.messagebox.showerror("Error", "No File selected")
    else:
        export_file_path = tk.filedialog.asksaveasfilename(defaultextension='.ico')
        img.save(export_file_path)
        tk.messagebox.showinfo("Success", "File converted and saved")
# By pillalamarri.in 
# http://www.pillalamarri.in/python/png-to-ico-converter/
# Set the window title
root.title('PNG to ICO Converter')
canvas1 = tk.Canvas(root, width=500, height=350, bg='lightblue')
canvas1.pack()
# Set the screen title
label1 = tk.Label(root, text='PNG to ICO Converter', bg='lightblue')
label1.config(font=('helvetica', 20))
canvas1.create_window(250, 100, window=label1)
# Browse button to browse for image
browseButton = tk.Button(text="Import PNG File", command=getPNG, bg=bg, fg=fg, font=font, width=width)
canvas1.create_window(250, 150, window=browseButton)
# Convert button to convert selected image and save
saveAsButton = tk.Button(text='Convert PNG to ICO', command=convertToICO, bg=bg, fg=fg, font=font, width=width)
canvas1.create_window(250, 200, window=saveAsButton)
root.mainloop()

Convert Code:

from PIL import Image
# Take input image from present folder
# By Pillalamarri.in
img = Image.open('input.png')
# Generate and save output image to present folder
img.save('output.ico')