import cv2
import numpy as np

# Load two images
img1 = cv2.imread('3D-Matplotlib.png')
img3 = cv2.imread('helloo.png')

#select the ROI
rows3,cols3,channels3 = img3.shape
roi3 = img1[50:rows3+50, 50:cols3+50 ]
print(rows3,cols3)

img3gray = cv2.cvtColor(img3,cv2.COLOR_BGR2GRAY)

ret3, mask3 = cv2.threshold(img3gray, 220, 255, cv2.THRESH_BINARY_INV)
cv2.imshow('m3', mask3)
mask_inv3 = cv2.bitwise_not(mask3)

img3_bg = cv2.bitwise_and(roi3,roi3,mask = mask_inv3)
img3_fg = cv2.bitwise_and(img3,img3,mask = mask3)

dst3 = cv2.add(img3_bg,img3_fg)
img1[50:rows3+50, 50:cols3+50 ] = dst3

cv2.imshow('i',mask_inv3)
cv2.imshow('1',img3_bg)
cv2.imshow('2',img3_fg)
cv2.imshow('d',dst3)
cv2.imshow('r1',img1)


cv2.waitKey(0)
cv2.destroyAllWindows()