Correção Python

#imgname = input(str)
imgname = "E:\\Desktop\\CCG\\Greenshoes\\segmentation\\in\\0_mask_.png"

def PaintImageWhite(g):
  image = cv.imread(g, cv.IMREAD_UNCHANGED)
  altura,largura=image.shape[:2]
  print(str(image.shape))
  for y in range(altura):
    for x in range(largura):
        if image[y,x][3] == 0:
          image[y,x] = [255,255,255,255]
  return image

imga = PaintImageWhite(imgname)

imgClone = "E:\\Desktop\\" +"ola_clone"+".png"
cv.imwrite(imgClone, imga)
#cv.imshow('imga',imga)

imgc = cv.cvtColor(imga, cv.COLOR_BGRA2BGR)
#cv.imshow('imgc',imgc)