How to make the background of images made by JSL transparent using python?

lala

I didn't succeed like this.

Thanks!

dt = Open("$SAMPLE_DATA/Big Class.jmp");

p1 = dt << Graph Builder(
    Show Control Panel(0),
    Variables(X(:height), Y(:weight), Overlay(:sex)),
    Elements(Points(X, Y, Legend(1)), Smoother(X, Y, Legend(2)))
);


img = p1 << Get Picture;


img_binary = img << Get Blob("PNG");


base64_img = Blob To Base64(img_binary);
Python Send("base64_img", base64_img);


Python Submit("
import base64
from PIL import Image
import numpy as np
import io

def remove_white_background(img_data_bytes):
    img = Image.open(io.BytesIO(img_data_bytes))
    if img.mode != 'RGBA':
        img = img.convert('RGBA')
    data = np.array(img)
    white_pixels = (data[:, :, 0] >= 240) & (data[:, :, 1] >= 240) & (data[:, :, 2] >= 240)
    data[white_pixels, 3] = 0
    new_img = Image.fromarray(data)
    output = io.BytesIO()
    new_img.save(output, format='PNG')
    return output.getvalue()

img_data_bytes = base64.b64decode(base64_img)
transparent_img_binary = remove_white_background(img_data_bytes)
");


transparent_img_binary = Python Get("transparent_img_binary");


transparent_img = New Image(transparent_img_binary);

lala

Python Send(img);
wrong.

 

Note that the pictures should not be saved during the processing.

Thanks!