Create an image compositing application using Flask. Install the Pillow module.

Overview

Select the image to be combined from the form, and select the file you want to combine, such as the logo. A composite image is displayed in the execution result. This time, the following two images are combined.

As usual, it's a peach again.

Code reality

The name will be overwritten at the time of compositing, but please do something about it.

`imgadd.py`


import os
from PIL import Image
from flask import Flask, render_template, request, redirect, url_for, send_from_directory, session
from werkzeug import secure_filename
app = Flask(__name__)

UPLOAD_FOLDER = './uploads'
ALLOWED_EXTENSIONS = set(['jpg','png','gif'])
app.config['UPLOAD_FOLDER'] = UPLOAD_FOLDER
app.config['SECRET_KEY'] = os.urandom(24)

def allowed_file(filename):
    return '.' in filename and \
        filename.rsplit('.', 1)[1] in ALLOWED_EXTENSIONS

@app.route('/')
def index():
    return render_template('img.html')


@app.route('/show_img', methods=['GET', 'POST'])
def show_img():
    if request.method == 'POST':
        img_data = request.files['img_data']
        logo_data = request.files['logo_data']

        if img_data and allowed_file(img_data.filename):
            filename = secure_filename(img_data.filename)
            img_data.save(os.path.join(app.config['UPLOAD_FOLDER'], filename))
            SQUARE_FIT_SIZE = 600
            MAIN_FILENAME = 'uploads/' + filename
            im = Image.open(MAIN_FILENAME)
            im.thumbnail((SQUARE_FIT_SIZE, SQUARE_FIT_SIZE))
            width, height = im.size

        if logo_data and allowed_file(logo_data.filename):
            filename = secure_filename(logo_data.filename)
            logo_data.save(os.path.join(app.config['UPLOAD_FOLDER'], filename))
            SQUARE_FIT_SIZE = 100
            LOGO_FILENAME = 'uploads/' + filename
            logo_im = Image.open(LOGO_FILENAME)
            logo_width, logo_height = logo_im.size

            im.paste(logo_im, (width-logo_width, height-logo_height), logo_im)
            im.save(os.path.join(app.config['UPLOAD_FOLDER'], filename))
            img_url = '/uploads/' + filename

            return render_template('img.html', img_url=img_url)


@app.route('/uploads/<filename>')
def uploaded_file(filename):
    return send_from_directory(app.config['UPLOAD_FOLDER'], filename)

if __name__ == '__main__':
    app.debug = True
    app.run()

`img.html`


{% extends "base.html" %}
{% block content %}
<form method="post" action="{{ url_for('show_img') }}" enctype="multipart/form-data">
Select the main image<input type="file" id="img_data" name="img_data">
Select logo<input type="file" id="logo_data" name="logo_data">
  <input type="submit" value="Send">
</fomr>
<div>
  {% if img_url %}
  <p><img src="{{ img_url }}"></p>
  {% endif %}
</div>
{% endblock %}