pip3 install pillow

from PIL import Image, ImageSequence
import os
import random

img_logo = Image.open("logo.png")
img_logo_width, img_logo_height = img_logo.size
img_logo_pixels = dict()
for w in range(img_logo_width):
  for h in range(img_logo_height):
    c = img_logo.getpixel((w,h))
    if c!=(0, 0, 0, 0):
      img_logo_pixels[(w, h)] = c[:3]+(125,)

def blendPixel(c1,c2):
  a1=256-c2[3]
  a2=c2[3]-(a1*c2[3])/256.0
  a=a1+a2
  c=(int((a1*c1[0] + a2*c2[0])/a), int((a1*c1[1] + a2*c2[1])/a), int((a1*c1[2] + a2*c2[2])/a),int(a))
  return c

def dealOneImage(image,offX=None,offY=None):
  w, h = image.size
  offX = offX if offX else random.random();
  offY = offY if offY else random.random();
  #如果图片尺寸小于水印图片，不加水印
  if w>=img_logo_width and h>=img_logo_height:
    top = int((w - img_logo_width)*offX)
    left = int((h - img_logo_height)*offY)
    for p, c in img_logo_pixels.items():
      p_x = (p[0]+top)
      p_y = (p[1]+left)
      image_c = image.getpixel((p_x,p_y))
      if(isinstance(image_c, tuple) and len(image_c)>2):
        image.putpixel((p_x, p_y), blendPixel(image_c,c))
  return image;

def dealOneFile(filePath):
  img_orign = Image.open(filePath)
  _,file_type = os.path.splitext(filePath)
  basename = os.path.basename(filePath)
  if file_type == '.gif':
    sequence = [];
    offX=random.random()
    offY=random.random()
    for f in ImageSequence.Iterator(img_orign):
      if len(sequence) % 2 == 0:
        offX=random.random()
        offY=random.random()
      sequence.append(dealOneImage(f.convert(),offX,offY))
    sequence[0].save(f'./output/{basename}', save_all=True, append_images=sequence[1:])
  else:
    image_out = (dealOneImage(img_orign))
    for x in range(1):
      image_out = (dealOneImage(image_out))
    image_out.save(f'./output/{basename}')

def dealSrc(srcDir):
  picFiles = [os.path.join(srcDir,fn) for fn in os.listdir(srcDir) if fn.endswith(('.gif', '.jpg', '.png','.jpeg'))]
  for filePath in picFiles:
    dealOneFile(filePath)