To create a black background in an image

black_back.py

import cv2
import numpy as np
import utils as ut
from matplotlib import pyplot as plt

img = '/home/brito/Documentos/Dev/tcc/img/f1.jpeg'
img = cv2.imread(img)
mask = np.zeros(img.shape[:2],np.uint8)

bgdModel = np.zeros((1,65),np.float64)
fgdModel = np.zeros((1,65),np.float64)

rect = (430,196,800,310)
cv2.grabCut(img,mask,rect,bgdModel,fgdModel,5,cv2.GC_INIT_WITH_RECT)

mask2 = np.where((mask==2)|(mask==0),0,1).astype('uint8')
img = img*mask2[:,:,np.newaxis]


plt.imshow(img)
plt.colorbar()
plt.show()
""" cv2.imshow('img',ut.resize(img))
cv2.imwrite('img.png',img)
cv2.waitKey(0)
cv2.destroyAllWindows() """