app.py

import gradio as gr
import os

def echo_image(image):
    return image

image_input = gr.Image(type="pil")
image_output = gr.Image(type="pil")

interface = gr.Interface(fn=echo_image, inputs=image_input, outputs=image_output)
interface.launch(server_port=os.getenv('GRADIO_SERVER_PORT', 7860))