app.py

import gradio as gr
from PIL import Image

apol=[]
pixels=[]

def plex(sketchpad, evt: gr.SelectData):
    pixels.append(evt.value["sketchpad"].data["selected"])
    inpts = np.array(pixels)
    intwos = Image.fromarray(inpts)
    inpts_inv = np.ones(shape=(inpts.shape[0]))
    inv_twos = Image.fromarray(inpts_inv)
    sketchpad=sketchpad["composite"].convert("RGB")
    apol.append(intwos)
    apol.append(inv_twos)
    apol.append(sketchpad)
    return apol

with gr.Blocks() as iface:
    sketchpad=gr.ImageEditor(type="pil",height=512,width=512,container=False,show_share_button=False,show_download_button=False)
    gal=gr.Gallery(columns=1)
    ##@gr.on(triggers=[sketchpad.select, sketchpad.change],inputs=[sketchpad],outputs=[gal])
    sketchpad.select(fn=plex,inputs=[sketchpad],outputs=[gal])

    ##iface=gr.Interface(plex,sketchpad,gr.Gallery(columns=1),live=True)
iface.queue()
iface.launch()