代码

from PIL import Image, ImageDraw, ImageFont

font = ImageFont.truetype('c:/windows/Fonts/Arial.ttf', 24)
# image: 图片  text：要添加的文本 font：字体
def add_text_to_image(image, text, font=font):
  rgba_image = image.convert('RGBA')
  text_overlay = Image.new('RGBA', rgba_image.size, (255, 255, 255, 0))
  image_draw = ImageDraw.Draw(text_overlay)

  text_size_x, text_size_y = image_draw.textsize(text, font=font)
  # 设置文本文字位置
  print(rgba_image)
  text_xy = (rgba_image.size[0] - text_size_x, rgba_image.size[1] - text_size_y)
  # 设置文本颜色和透明度
  image_draw.text(text_xy, text, font=font, fill=(76, 234, 124, 180))

  image_with_text = Image.alpha_composite(rgba_image, text_overlay)

  return image_with_text

if __name__ == '__main__':
    im_before = Image.open("yy.jpg")
    # im_before.show()
    W_text = input('请输入水印文字:').strip()
    im_after = add_text_to_image(im_before, W_text)
    im_after.show()
    # im.save('im_after.jpg')

来源：1