app.py

import gradio as gr
import numpy as np
from rembg import remove
from PIL import Image

def remove_bg_and_replace(image, background=None):
    if image is None:
        return None
    
    # Convert to RGBA and remove background
    image = image.convert("RGBA")
    removed_bg = remove(image)
    
    if background is not None:
        background = background.convert("RGBA").resize(image.size)
        combined = Image.alpha_composite(background, removed_bg)
        return combined
    
    return removed_bg

description = "Upload an image to remove the background and optionally add a new one."

demo = gr.Interface(
    fn=remove_bg_and_replace,
    inputs=[gr.Image(type="pil"), gr.Image(type="pil")],  # Removed optional=True
    outputs=gr.Image(type="pil"),
    title="Background Removal & Replacement",
    description=description,
)

demo.launch()