app.py

import gradio as gr
from gradio_imageslider import ImageSlider
from PIL import ImageFilter


def fn(img1, img2):
    #if not im or not im[0]:
    #    return im
    return (img1, img2) #(im[0], im[0].filter(filter=ImageFilter.GaussianBlur(radius=10)))


with gr.Blocks() as demo:
    with gr.Group():
        with gr.Row():
            img1 = gr.Image()
            img2 = gr.Image()
        imgsldr = ImageSlider(label="Blur image", value=["https://lllyasviel-ic-light.hf.space/file=/tmp/gradio/b6d84562c50f5d7dec385dc305f43784b778bb1f/i9.png",
                                                                 "https://lllyasviel-ic-light.hf.space/file=/tmp/gradio/495c8d96f46ac9679c31cf662d2d0dc4f95287f8/image.webp#"])
        gr.Button().click(fn, [img1, img2], imgsldr)
        #img1.upload(fn, inputs=img1, outputs=img1)

if __name__ == "__main__":
    demo.launch()