python实现图片加文字水印

from PIL import Image, ImageDraw, ImageFont


def add_water(image, text, fontsize):
    # 字体文件
    font = ImageFont.truetype('1641789485961483.otf', fontsize)

    # 添加背景
    new_img = Image.new('RGBA', (image.size[0] * 3, image.size[1] * 3), (255, 255, 255, 255))
    new_img.paste(image, image.size)

    # 添加水印
    font_len = len(text)
    rgba_image = new_img.convert('RGBA')
    text_overlay = Image.new('RGBA', rgba_image.size, (0, 0, 0, 0))
    image_draw = ImageDraw.Draw(text_overlay)

    # 水印数量
    for i in range(0, rgba_image.size[0], font_len * 40 + 300):
        for j in range(0, rgba_image.size[1], 300):
            # print(f'i:{i}, j:{j}, text:{text}, font:{font}')
            image_draw.text((i, j), text, font=font, fill=(0, 0, 0, 50))

    # 水印文字角度
    text_overlay = text_overlay.rotate(45)
    image_with_text = Image.alpha_composite(rgba_image, text_overlay)

    image_with_text = image_with_text.crop((image.size[0], image.size[1], image.size[0] * 2, image.size[1] * 2))
    return image_with_text


if __name__ == '__main__':
    pic = '1.png'          # 需要加水印的图片
    text = "我是水印"       # 水印文字
    fontsize = 32           # 文字大小

    img = Image.open(pic)
    fill_img = add_water(img, text, fontsize)
    # 一定要保存为png格式
    fill_img.save(u'2.png')