Colour Paletter

                    
from flask import Flask, flash, request, redirect, url_for, send_from_directory, render_template
from flask_bootstrap import Bootstrap4
from werkzeug.utils import secure_filename
import numpy as np
from PIL import Image
import matplotlib.pyplot as plt
import os
from sklearn.cluster import KMeans


# Numpy bit to get colour info from image
def extract_colours(filename):
    img = Image.open(f"./static/images/temp/" + filename)
    img_array = np.array(img)
    num_colours = 7
    pixels = img_array.reshape(-1, 3)
    kmeans = KMeans(n_clusters=num_colours, random_state=0).fit(pixels)
    centers = kmeans.cluster_centers_.astype(int)
    labels = kmeans.labels_
    counts = np.bincount(labels)
    sorted_idx = np.argsort(-counts)
    dominant_colours = centers[sorted_idx]

    for i, (col, count) in enumerate(zip(dominant_colours, counts[sorted_idx])):
        print(f"{i+1}. RGB: {col.tolist()}, pixels: {count}")

    palette = np.zeros((50, 50 * num_colours, 3), dtype=np.uint8)
    for i, col in enumerate(dominant_colours):
        palette[:, i*50:(i+1)*50] = col

    plt.figure(figsize=(8, 2))
    plt.imshow(palette)
    plt.axis("off")
    plt.savefig(f'./static/images/outputs/'+filename, dpi=250)
    # plt.show()

# Define a function for opening images or allow image links for now
UPLOAD_FOLDER = './static/images/temp'
OUTPUT_FOLDER = './static/images/outputs'
ALLOWED_EXTENSIONS = {'txt', 'pdf', 'png', 'jpg', 'jpeg', 'gif'}

app = Flask(__name__)
bootstrap = Bootstrap4(app)
app.config['UPLOAD_FOLDER'] = UPLOAD_FOLDER
app.config['OUTPUT_FOLDER'] = OUTPUT_FOLDER

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

@app.route('/', methods=['GET', 'POST'])
def upload_file():
    if request.method == 'POST':
        # check if the post request has the file part
        if 'file' not in request.files:
            flash('No file part')
            return redirect(request.url)
        file = request.files['file']
        # If the user does not select a file, the browser submits an
        # empty file without a filename.
        if file.filename == '':
            flash('No selected file')
            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))
            extract_colours(filename)
            # return redirect(url_for('download_file', name=filename))
    return render_template('index.html', images = os.listdir(app.config['UPLOAD_FOLDER']))

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