error bitwise operation

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Hello, I am a engineer student in Universidad Católica de Temuco (Chile) and currently I'm working on my thesis. I'm making a prototype in real time chroma key on linux (ubuntu 11|.04). So this prototype is being developed in python with opencv. As can see I could apply a mask with a range of green colors (light and dark green) - this showing in the window called res resulting from the mask denied (leaving in black green hues ). the problem is the background image shown in negative any suggestions? Regards

#green objects detected and an image replacement
#also eliminates noise



import cv2
import numpy as np
from PIL import Image
#Initialize camera
capture = cv2.VideoCapture(0)
image1= cv2.imread('playa2.jpg')
capture.set(3,600)
capture.set(4,400)



while(1):

  #Capture image from camera and I make  RGB -> HSV
  _, image = capture.read()
  _,camera = capture.read()
  hsv = cv2.cvtColor(image, cv2.COLOR_BGR2HSV)
  #I APPLY THE COLOR RANGE TO BE DETECTED. IN THIS CASE LIGTH GREEN AND DARK GREEN
  DARK_GREEN = np.array([49,50,50], dtype=np.uint8)
  LIGTH_GREEN = np.array([80, 255, 211], dtype=np.uint8)
  #I CREATE A MASK WITH THE COLOR RANGE I WANT
  mask = cv2.inRange(hsv, verde_bajos, verde_altos)
  # kernel CREATION 4x4 TO ELIMINATE NOISE
  kernel = np.ones((3,3),np.uint8)
  #kernel1 = np.ones((3,3), np.uint8)
  #I apply erosion
  mask = cv2.erode(mask,kernel,iterations = 2)
  #I apply dilation
  mask = cv2.dilate(mask,kernel,iterations = 2)
  mask_inv = cv2.bitwise_not(mask)
  mask = cv2.morphologyEx(mask, cv2.MORPH_OPEN, kernel, iterations = 1)
  mask= cv2.morphologyEx(mask, cv2.MORPH_CLOSE, kernel, iterations = 1)
  res = cv2.bitwise_not(image1,image,mask=mask)
  #show binary mask
  cv2.imshow('mask', mask)
  #show default camera
  cv2.imshow('Camara', camara)
  #show result
  cv2.imshow('res', res)

  tecla = cv2.waitKey(5) & 0xFF
  if tecla == 27:
     break
 cv2.destroyAllWindows()

and the real color of the picture