import gradio as gr
import numpy as np

def dummy_fn(img):
    return img

# Create transparent base (RGBA)
canvas = np.zeros((480, 640, 4), dtype=np.uint8)
canvas[..., 0] = 255  # R
canvas[..., 1] = 105  # G
canvas[..., 2] = 180  # B
canvas[..., 3] = 60   # alpha for semi-transparent pink background

iface = gr.Interface(
    fn=dummy_fn,
    inputs=gr.Image(
        label="🖌️ Paint ROI Mask",
        tool="sketch",
        type="numpy",
        image_mode="RGBA",
        value=canvas,
        height=480,
    ),
    outputs="image"
)

iface.launch()