I have a screenshot taken from a chat platform and want to change the background of the chat to white, including profile pictures of participants. The code from this Question works fine if the name of the chat group is not displayed in the screenshot. Image 1 is an an example of the original image and image 2 is the so far achieved result:

And I want to achieve something similar to image 3:

This is the code I used from the question:

import cv2
import numpy as np

filename = ("/Users/user/Desktop/test2.png")

image = cv2.imread(filename)

hsv_img = cv2.cvtColor(image, cv2.COLOR_BGR2HSV)  # rgb to hsv color space

s_ch = hsv_img[:, :, 1]  # Get the saturation channel

thesh = cv2.threshold(s_ch, 5, 255, cv2.THRESH_BINARY)[1]  # Apply threshold - pixels 
above 5 are going to be 255, other are zeros.
thesh = cv2.morphologyEx(thesh, cv2.MORPH_OPEN, 
cv2.getStructuringElement(cv2.MORPH_ELLIPSE, (7, 7)))  # Apply opening morphological 
operation for removing artifacts.

cv2.floodFill(thesh, None, seedPoint=(0, 0), newVal=128, loDiff=1, upDiff=1)  # Fill 
the background in thesh with the value 128 (pixel in the foreground stays 0.

image[thesh == 128] = (255, 255, 255)  # Set all the pixels where thesh=128 to white.

cv2.imwrite('Filtering1.jpg', image)  # Save the output image.

I am quite new with this so I need to know what should I add/ change in the code to achieve the result in image 3.