Python 111: Image Processing with PySimpleGUI

In this tutorial, we will be exploring how to perform image processing using PySimpleGUI, a Python library that allows for the creation of simple, yet powerful GUI interfaces. This tutorial is part of the ongoing series "だれでもPython 111回", where we explore various aspects of Python programming.

Before we start, make sure you have Python installed on your system. You can download the latest version of Python from the official website (python.org). Additionally, you will need to install PySimpleGUI, which can be done using pip, the Python package manager. You can install PySimpleGUI by running the following command in your terminal or command prompt:

pip install PySimpleGUI

Now that we have all the necessary requirements installed, let’s get started with the image processing using PySimpleGUI.

Step 1: Importing the necessary libraries
First, we need to import the necessary libraries for our image processing task. In this tutorial, we will use the PySimpleGUI library for creating the GUI interface and the PIL (Python Imaging Library) library for image processing operations. Here is the code to import the required libraries:

import PySimpleGUI as sg
from PIL import Image

Step 2: Creating the GUI
Now, let’s create the GUI interface using PySimpleGUI. We will create a simple window with a button to load an image and display it on the screen. Here is the code to create the GUI interface:

layout = [[sg.Button('Load Image')]]
window = sg.Window('Image Processing', layout)

Step 3: Image processing functions
Next, we will define the functions for loading and displaying the image on the screen. We will also add a simple image processing operation, such as converting the image to grayscale. Here is the code for the image processing functions:

def load_image(filename):
    return Image.open(filename)

def display_image(image):
    image.show()

def grayscale_image(image):
    return image.convert('L')

Step 4: Event loop
Now, we need to create an event loop to handle user interactions with the GUI. We will add an event handler for the ‘Load Image’ button, which will load the image, convert it to grayscale, and display it on the screen. Here is the code for the event loop:

while True:
    event, values = window.read()

    if event == sg.WIN_CLOSED:
        break
    elif event == 'Load Image':
        image_filename = sg.popup_get_file('Select an image file', file_types=(("Image Files", "*.jpg *.png"),))
        image = load_image(image_filename)
        grayscale_image = grayscale_image(image)
        display_image(grayscale_image)

Step 5: Running the program
To run the program, save the code in a Python file (e.g., image_processing.py) and run it using the Python interpreter. The GUI window will appear, and you can click the ‘Load Image’ button to select an image file, which will be displayed on the screen in grayscale.

That’s it! You have successfully created a simple image processing program using PySimpleGUI. You can further enhance the program by adding more image processing operations and functionalities to the GUI interface. Happy coding!