app.py

import gradio as gr

def greet(img1, img2):
    return img2

demo = gr.Interface(fn=greet, 
                    inputs=["image", "image"], 
                    outputs="image", 
                    #examples=[["27-24522.jpg", "28-24766.jpg"]],
                    examples=[["27-24522.jpg", None]])
demo.launch()