app.py

import gradio as gr
import imageio
import numpy as np

def hex_to_rgb(hex_color):
    """Convert hex color string (#RRGGBB) to an (R, G, B) tuple."""
    hex_color = hex_color.lstrip("#")
    return tuple(int(hex_color[i:i+2], 16) for i in (0, 2, 4))

def create_blank_image(width, height, hex_color):
    """Create a new RGB image with given width, height, and color."""
    r, g, b = hex_to_rgb(hex_color)
    img = np.full((height, width, 3), (r, g, b), dtype=np.uint8)
    return img

def dummy(img, invert_mask):
    if img is None:
        raise ValueError("No image provided.")
    mask = img["mask"]
    if invert_mask and mask is not None:
        mask = 255 - np.array(mask)
    imageio.imwrite("output_image.png", mask)
    return img["image"], mask

with gr.Blocks() as demo:
    with gr.Accordion("Create Blank Image", open=False):
        with gr.Row():
            width_input = gr.Number(label="Width", value=512, precision=0)
            height_input = gr.Number(label="Height", value=512, precision=0)
            color_input = gr.ColorPicker(label="Color", value="#969696")  # hex color
            create_btn = gr.Button("Create Image")
    
    with gr.Row():
        img = gr.Image(tool="sketch", label="base image", show_label=True, min_width=600)
        img1 = gr.Image()
        img2 = gr.Image(label="mask image", show_label=True)

    invert = gr.Checkbox(label="Invert mask")
    btn = gr.Button("Process")

    btn.click(dummy, [img, invert], [img1, img2])
    create_btn.click(create_blank_image, 
                     [width_input, height_input, color_input], 
                     img)

demo.launch(debug=True, show_error=True, quiet=False)