A program to automatically resize an image while maintaining aspect ratio in Python
Introduction
Sometimes you need to resize an image from keeping aspect ratio. Especially when it’s a very large number of files. This application allows you to resize the image, save it to the desired folder, as well as invert the color (suitable for editing waveforms) and rename the file. Perhaps there are already some programs for it, but there was a need to do it yourself. I will share the code with you, maybe someone will need (Program code at the end of the article).
Program functions
Before me, the task was to make a simple program that allows you to resize an image while maintaining aspect ratio. Without thinking for a long time, I decided to write a small script that would satisfy such needs:
Ability to work with different types of image files (png, bmp, jpg, etc.)
Convenient to add files to the program
Ability to add multiple images at once
Ability to rename edited file
Ability to invert colors
Convenient choice of path to save files
Simple program interface
Appearance
First, let’s look at what the program looks like and what it does, and then move on to the actual implementation.
The program interface looks like this:
As you can see, the program is not overloaded superfluous details. Let’s analyze each element in more detail.
Image files – selection of images to be edited. The standard file explorer will open.
Save in folder – selection of a folder where the edited file will be saved; if the user does not select a folder, they will be saved in the folder of the program root called Edited photos (the folder is created automatically). Will open standard file explorer.
Image height (cm) – here you need to enter the height of the image, which is necessary (the width will be edited automatically while maintaining the proportions)
Invert color – when this checkbox is selected, the colors of the image will be inverted to RGBA (This is very handy if you are working with waveforms.)
Rename the file – when a checkbox is selected, it unlocks the input field “Add ending to file name” and adds the appropriate text to the file name.
Example: image name “x”. In field Add ending to file name specify “edit”. The file or files are saved with this name: “x_edit”.
If the checkbox is not selected, the file will be saved with the same name (“x”)Convert – Editing the file and saving with the appropriate parameters as above.
Program implementation
The code was written in Python using the following libraries:
from tkinter import *
from tkinter import messagebox
from tkinter import filedialog
import PIL.ImageOps
from PIL import Image
import errno
import osThe complete code of the program in Python:
from tkinter import *
from tkinter import messagebox
from tkinter import filedialog
import PIL.ImageOps
from PIL import Image
import errno
import os
##--------------------------------------------------------------------------------------------------------------------##
##Creating a folder at the root of the program
def make_sure_path_exists(path):
try: os.makedirs(path)
except OSError as exception:
if exception.errno != errno.EEXIST:
raise
##Фуfunction that translates from cm to pixel
def cm_in_px(cm):
global px
px = int(cm) * 38
return px
##Creating a folder at the root of the program-------------------------------------------------------------------------#
make_sure_path_exists('Edited photos')
#----------------------------------------------------------------------------------------------------------------------#
##ФScale and store aspect ratio
def scale_image(input_image_path,
output_image_path,
width=None,
height=None
):
original_image = Image.open(input_image_path)
w, h = original_image.size
print('The original image size is {wide} wide x {height} '
'high'.format(wide=w, height=h))
if width and height:
max_size = (width, height)
elif width:
max_size = (width, h)
elif height:
max_size = (w, height)
else:
# No width or height specified
raise RuntimeError('Width or height required!')
original_image.thumbnail(max_size, Image.ANTIALIAS)
original_image.save(output_image_path)
scaled_image = Image.open(output_image_path)
width, height = scaled_image.size
print('The scaled image size is {wide} wide x {height} '
'high'.format(wide=width, height=height))
#----------------------------------------------------------------------------------------------------------------------#
##Signature checkbox 2
def chek_cb2():
global message_entry
if ismarried2.get() == 0:
message_entry = Entry(window, state=DISABLED, bd=2, width = 48)
message_entry.place(x=10, y=275)
return Label(window, text="Add ending to file name:", font=('Arial', 10)).place(x=10, y=250)
else:
message_entry = Entry(window, state=NORMAL, bd=2, width = 48)
message_entry.place(x=10, y=275)
return Label(window, text="Add ending to file name:", font=('Arial', 10)).place(x=10, y=250)
#----------------------------------------------------------------------------------------------------------------------#
##file renaming
def rename():
global last_name
if ismarried2.get() == 1:
last_name="_" + message_entry.get()
else:
last_name=""
return last_name
#----------------------------------------------------------------------------------------------------------------------#
#----------------------------------------------------------------------------------------------------------------------#
##Path to upload images
number_f = 0
def clicked_dialogOpen():
global choosefile
global number_f
choosefile = filedialog.askopenfilename(multiple=True, parent = window, filetypes=(("Image files", "*.png"), ("all files", "*.*")))
number_f = len(choosefile)
label_file()
#----------------------------------------------------------------------------------------------------------------------#
##Check for characters in the string
def check_name():
global d
d = 0
for i in message_entry.get():
if i.isalpha():
d += 1
elif i.isdigit():
d+= 1
else:
d+= 1
return d
#----------------------------------------------------------------------------------------------------------------------#
##Display information about the number of selected images
def label_file():
if number_f == 0:
lbl2 = Label(window, text="Image not selected", font=('Arial', 9), fg = 'red')
lbl2.place(x=start_pos_x, y=start_pos_y + step_des * 0.9)
elif number_f == 1:
lbl2 = Label(window, text="File selected ".format(number_f), font=('Arial', 9), fg = 'green')
lbl2.place(x=start_pos_x, y=start_pos_y + step_des * 0.9)
else:
lbl2 = Label(window, text="Files selected - {} ".format(number_f), font=('Arial', 9), fg = 'green')
lbl2.place(x=start_pos_x, y=start_pos_y + step_des * 0.9)
#----------------------------------------------------------------------------------------------------------------------#
##Open the path to save the file
filename = 0
def browse_button():
global filename
filename = filedialog.askdirectory()
label_folder()
#----------------------------------------------------------------------------------------------------------------------#
##Display save directory information
def label_folder():
if filename == 0:
lbl = Label(window, text="Path not selected", font=('Arial', 9), fg = 'red')
lbl.place(x=start_pos_x, y=start_pos_y + step_des * 2.3)
elif filename == '':
lbl = Label(window, text=os.getcwd() + '/Edited photos/', font=('Arial', 9), fg = 'green')
lbl.place(x=start_pos_x, y=start_pos_y + step_des * 2.3)
else:
lbl = Label(window, text=filename, font=('Arial', 9), fg = 'green')
lbl.place(x=start_pos_x, y=start_pos_y + step_des * 2.3)
#----------------------------------------------------------------------------------------------------------------------#
##Zoom and record an image
def scale():
check_name()
if number_f < 1:
messagebox.showerror("Error", "No file selected")
if ismarried2.get() == 1 and d < 1:
messagebox.showerror("Error", "Parameter not entered: Add ending to file name")
else:
for i in range(number_f):
try:
with open(choosefile[i]) as im:
r = os.path.splitext(choosefile[i])
var = (os.path.basename(r[0]), r[1])
if filename == 0:
folder = os.getcwd() + '/Edited photos/'
output_name = folder + var[0] + rename() + var[1]
scale_image(input_image_path=choosefile[i],
output_image_path=output_name,
height=cm_in_px(message_cm.get()))
if ismarried.get() == 1:
image = Image.open(output_name)
if image.mode == 'RGBA':
r, g, b, a = image.split()
rgb_image = Image.merge('RGB', (r, g, b))
inverted_image = PIL.ImageOps.invert(rgb_image)
r2, g2, b2 = inverted_image.split()
final_transparent_image = Image.merge('RGBA', (r2, g2, b2, a))
final_transparent_image.save(output_name)
else:
inverted_image = PIL.ImageOps.invert(image)
inverted_image.save(output_name)
else:
folder = filename
output_name = filename + '/' + var[0] + rename() + var[1]
scale_image(input_image_path=choosefile[i],
output_image_path = output_name,
height=cm_in_px(message_cm.get()))
if ismarried.get() == 1:
image = Image.open(output_name)
if image.mode == 'RGBA':
r, g, b, a = image.split()
rgb_image = Image.merge('RGB', (r, g, b))
inverted_image = PIL.ImageOps.invert(rgb_image)
r2, g2, b2 = inverted_image.split()
final_transparent_image = Image.merge('RGBA', (r2, g2, b2, a))
final_transparent_image.save(output_name)
else:
inverted_image = PIL.ImageOps.invert(image)
inverted_image.save(output_name)
print("Çhose",choosefile[0])
except:
print('Error')
messagebox.showerror("Error", "An error has occurred.nnThe program is intended for image processing only.nnContact the e-mail address:nolehlastovetskyi99@gmail.com")
quit()
messagebox.showinfo("Message", "Completed!nChanged {} files.nFiles saved in the directory:n{}".format(number_f, folder))
#----------------------------------------------------------------------------------------------------------------------#
##--------------------------------------------------------------------------------------------------------------------##
window = Tk()
ismarried = IntVar(value= 2)
ismarried.set(0)
ismarried2 = IntVar(value= 2)
ismarried2.set(0)
chek_cb2()
rename()
##------------------------------------------------------------------------------------------------------------------------##
start_pos_x = 10
start_pos_y = 10
height_button = 2
width_button = 32
font_button = ("Arial Bold", 11)
font_checkbox = ("Arial", 11)
font_combobox = ('Arial', 11)
font_label = ("Arial Bold", 11)
step_des = 60
label_folder()
label_file()
window.title("Scale")
btn_dialogOpen = Button(window, text="Image files", command=clicked_dialogOpen, height=height_button,
width=width_button, font=font_button)
btn_dialogOpen.place(x=start_pos_x, y=start_pos_y)
btn_browsebutton = Button(window, text="Save in folder", command=browse_button, height=height_button,
width=width_button, font=font_button)
btn_browsebutton.place(x=start_pos_x, y=start_pos_y + step_des + 25)
lbl = Label(window, text="Image height (cm):", font=font_label)
lbl.place(x=start_pos_x + 1, y=start_pos_y + step_des * 2.95)
message_cm = Entry(width=7)
message_cm.place(x=start_pos_x + 150, y=start_pos_y + step_des * 2.97)
message_cm.insert(0, "9")
ismarried_checkbutton = Checkbutton(text="Invert color", variable=ismarried, font =font_checkbox)
ismarried_checkbutton.place(x=start_pos_x + 1, y=start_pos_y + step_des * 3.4)
ismarried_checkbutton2 = Checkbutton(text="Rename the file", variable=ismarried2,
font = font_checkbox, command = chek_cb2)
ismarried_checkbutton2.place(x=start_pos_x + 170, y=start_pos_y + step_des * 3.4)
btn_scale = Button(window, text="Convert", command=scale, height=height_button, width=width_button,
font=font_button, state = NORMAL)
btn_scale.place(x=start_pos_x, y=start_pos_y + step_des * 5.2)
Label(window, text="Github:", font=('Arial', 8)).place(x=10, y=385)
x = (window.winfo_screenwidth() - window.winfo_reqwidth()) / 2
y = (window.winfo_screenheight() - window.winfo_reqheight()) / 2
window.wm_geometry("+%d+%d" % (x, y))
window.maxsize(320,410)
window.minsize(320,410)
window.resizable(0, 0)
window.mainloop()
Links to github:https://github.com/Oleh-Last/Python.git
