app.py

import gradio as gr
import cv2
import numpy as np

def sketch_image(image):
    gray = cv2.cvtColor(image, cv2.COLOR_RGB2GRAY)
    inverted = 255 - gray
    blurred = cv2.GaussianBlur(inverted, (21, 21), 0)
    sketch = cv2.divide(gray, 255 - blurred, scale=256)
    return sketch

iface = gr.Interface(fn=sketch_image, inputs="image", outputs="image")

iface.launch(share=True)