main.py

import os
from flask import Flask, flash, request, redirect, url_for, render_template
from werkzeug.utils import secure_filename
import colorgram
import webcolors


app = Flask(__name__)
UPLOAD_FOLDER = 'static/images/'
app.config['UPLOAD_FOLDER'] = UPLOAD_FOLDER
app.config['SECRET_KEY'] = os.environ.get('SECRET_KEY')

ALLOWED_EXTENSIONS = set(['png', 'jpg', 'jpeg', 'gif'])
MAX_COLOURS = 500


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


@app.route('/')
def home():
    return render_template('upload_image.html')


@app.route('/', methods=['POST'])
def upload_image():
    if 'file' not in request.files:
        flash('No file part')
        return redirect(request.url)
    file = request.files['file']
    if file.filename == '':
        flash('No image selected for uploading')
        return redirect(request.url)
    if file and allowed_file(file.filename):
        filename = secure_filename(file.filename)
        file.save(os.path.join(app.config['UPLOAD_FOLDER'], filename))
        flash('Image successfully uploaded and displayed below')
        colors = image_colors(filename)
        return render_template('upload_image.html', filename=filename, colors=colors, color_count=0)
    else:
        flash('Allowed image types are -> png, jpg, jpeg, gif')
        return redirect(request.url)


@app.route('/display/<filename>')
def display_image(filename):
    return redirect(url_for('static', filename='images/' + filename), code=301)


def closest_colour(requested_colour):
    min_colours = {}
    for key, name in webcolors.CSS3_HEX_TO_NAMES.items():
        r_c, g_c, b_c = webcolors.hex_to_rgb(key)
        rd = (r_c - requested_colour[0]) ** 2
        gd = (g_c - requested_colour[1]) ** 2
        bd = (b_c - requested_colour[2]) ** 2
        min_colours[(rd + gd + bd)] = name
    return min_colours[min(min_colours.keys())]


def image_colors(filename):
    rgb_colors = colorgram.extract('static/images/'+filename, MAX_COLOURS)
    colors = {}
    for color in rgb_colors:
        rgb_color = (color.rgb.r, color.rgb.b, color.rgb.b)
        try:
            colors[webcolors.rgb_to_name(rgb_color, spec='css3')] = webcolors.rgb_to_hex(rgb_color)
        except ValueError:
            colors[closest_colour(rgb_color)] = webcolors.rgb_to_hex(rgb_color)
    # print(colors)
    return colors


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