Python으로 폴더안의 모든 사진에 워터마크 넣기

import os, glob, random
from PIL import Image

import PIL.Image as Image
import PIL.ImageDraw as ImageDraw
import PIL.ImageFont as ImageFont

def wtrmk(fileName):

      fonts_dir = os.path.join(os.environ['WINDIR'], 'Fonts')
      font_name = 'NanumMyeongjoExtraBold.TTF' # 'verdana.ttf' 
      font = ImageFont.truetype(os.path.join(fonts_dir, font_name), 30)

      img = Image.open(fileName)
      size = width, height = img.size
      
      draw = ImageDraw.Draw(img)
      draw.text((0, 0), "예담플라워\nYedam Flower", (255, 255, 255), font=font)


      rotAng = random.randint(-15, 15+1) #  -15 deg. <= rotAng  <= 15 deg.
      
      x_pos = int(width  / 2) - abs(int(rotAng * 7.3)) # give it a little variation
      y_pos = int(height / 2) - abs(int(rotAng * 2.7)) # using already generated variable rotAng
      
      if rotAng < 0 :
            rotAng += 360
            
      wtrMarkFile = '.\\Watermark\\watermarkBY.png'
      mask_img = Image.open(wtrMarkFile).rotate(rotAng).convert('L')
      
      img.paste("white", (x_pos, y_pos), mask_img)
      #img.show()
      img.save(fileName)

if __name__ == '__main__' :
   images = glob.glob('*.jpg')

   for img in images:
       wtrmk(img)