A silly thing I made with openCV it detects faces and sticks an image over them

sillyThing.py

import cv2
import sys

imagePath = sys.argv[1]
cascPath = sys.argv[2]
kronk = cv2.imread(sys.argv[3], -1)

faceCascade = cv2.CascadeClassifier(cascPath)

image = cv2.imread(imagePath)
gray = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)

faces = faceCascade.detectMultiScale(
    gray,
    scaleFactor=1.1,
    minNeighbors=5,
    minSize=(30, 30),
    flags = cv2.cv.CV_HAAR_SCALE_IMAGE
)

print "Found {0} faces!".format(len(faces))

for (x, y, w, h) in faces:
    #because handling transparency is weird
    for c in range(0,3):
      image[y:y+kronk.shape[0], x:x+kronk.shape[1], c] = kronk[:,:,c] * (kronk[:,:,3]/255.0) +  image[y:y+kronk.shape[0], x:x+kronk.shape[1], c] * (1.0 - kronk[:,:,3]/255.0)

cv2.imwrite("out.jpg", image)