使用python PIL库批量对图片添加水印的过程详解

pip install Pillow

F:\python_study\image\image01

from PIL import Image, ImageDraw, ImageFont, ImageEnhance
import os

class TestText():
    def __init__(self):
        super(TestText, self).__init__()
        self.pic_path = input('图片路径：')
        self.pic_text = input('水印文字：')
        self.p_flag = int(input('水印位置（1：左上角，2：左下角，3：右上角，4：右下角，5：居中）：'))
        self.a = float(input('水印透明度（0—1之间的1位小数）：'))

def truetype(font=None, size=10, index=0, encoding="", layout_engine=None):
    """
    Load a TrueType or OpenType font from a file or file-like object,
    and create a font object.
    This function loads a font object from the given file or file-like
    object, and creates a font object for a font of the given size.

    Pillow uses FreeType to open font files. On Windows, be aware that FreeType
    will keep the file open as long as the FreeTypeFont object exists. Windows
    limits the number of files that can be open in C at once to 512, so if many
    fonts are opened simultaneously and that limit is approached, an
    ``OSError`` may be thrown, reporting that FreeType "cannot open resource".
    A workaround would be to copy the file(s) into memory, and open that instead.

    This function requires the _imagingft service.

    :param font: A filename or file-like object containing a TrueType font.
                 If the file is not found in this filename, the loader may also
                 search in other directories, such as the :file:`fonts/`
                 directory on Windows or :file:`/Library/Fonts/`,
                 :file:`/System/Library/Fonts/` and :file:`~/Library/Fonts/` on
                 macOS.

    :param size: The requested size, in pixels.
    :param index: Which font face to load (default is first available face).
    :param encoding: Which font encoding to use (default is Unicode). Possible
                     encodings include (see the FreeType documentation for more
                     information):

C:\Windows\Fonts

self.font = ImageFont.truetype("cambriab.ttf", size=35)

image = Image.open(img).convert('RGBA') 

new_img = Image.new('RGBA', image.size, (255, 255, 255, 0))
image_draw = ImageDraw.Draw(new_img)

w, h = image.size  

w1 = self.font.getsize(self.pic_text)[0]  # 获取字体宽度
h1 = self.font.getsize(self.pic_text)[1]  # 获取字体高度

 if self.p_flag == 1:  # 左上角
      location = (0, 0)
 elif self.p_flag == 2:  # 左下角
      location = (0, h - h1)
 elif self.p_flag == 3:  # 右上角
      location = (w - w1, 0)
 elif self.p_flag == 4:  # 右下角
      location = (w - w1, h - h1)
 elif self.p_flag == 5:  # 居中
      location = (h/2, h/2)

image_draw.text(location, self.pic_text, font=self.font, fill="blue")

 transparent = new_img.split()[3]
 transparent = ImageEnhance.Brightness(transparent).enhance(self.a)
 new_img.putalpha(transparent)

 Image.alpha_composite(image, new_img).save(img)

 text_pic = TestText()
    try:
        file_list = os.listdir(text_pic.pic_path)
        for i in range(0, len(file_list)):
            filepath = os.path.join(text_pic.pic_path, file_list[i])  
            if os.path.isfile(filepath): 
                filetype = os.path.splitext(filepath)[1] 
                if filetype == '.png': 
                    text_pic.test_text(filepath) 
                else:
                    print("图片格式有误，无法添加水印，请使用png格式图片")
        print('批量添加水印完成')
    except:
        print('输入的文件路径有误，请检查~~')

# -*- coding:utf-8 -*-
# 作者：虫无涯
# 日期：2023/11/21 
# 文件名称：test_text_pic.py
# 作用：批量给图片添加文字水印和图片水印
# 联系：VX(NoamaNelson)
# 博客：https://blog.csdn.net/NoamaNelson


from PIL import Image, ImageDraw, ImageFont, ImageEnhance
import os


class TestText():
    def __init__(self):
        super(TestText, self).__init__()
        self.pic_path = input('图片路径：')
        self.pic_text = input('水印文字：')
        self.p_flag = int(input('水印位置（1：左上角，2：左下角，3：右上角，4：右下角，5：居中）：'))
        self.a = float(input('水印透明度（0—1之间的1位小数）：'))

        # 设置字体
        self.font = ImageFont.truetype("cambriab.ttf", size=35)

    # 文字水印
    def test_text(self, img):
        global location
        image = Image.open(img).convert('RGBA') 
        new_img = Image.new('RGBA', image.size, (255, 255, 255, 0)) 
        image_draw = ImageDraw.Draw(new_img) 
        w, h = image.size  # 图片大小
        w1 = self.font.getsize(self.pic_text)[0]  # 字体宽度
        h1 = self.font.getsize(self.pic_text)[1]  # 字体高度

        # 设置水印文字位置
        if self.p_flag == 1:  # 左上角
            location = (0, 0)
        elif self.p_flag == 2:  # 左下角
            location = (0, h - h1)
        elif self.p_flag == 3:  # 右上角
            location = (w - w1, 0)
        elif self.p_flag == 4:  # 右下角
            location = (w - w1, h - h1)
        elif self.p_flag == 5:  # 居中
            location = (h/2, h/2)
        # 绘制文字
        image_draw.text(location, self.pic_text, font=self.font, fill="blue")

        # 设置透明度
        transparent = new_img.split()[3]
        transparent = ImageEnhance.Brightness(transparent).enhance(self.a)
        new_img.putalpha(transparent)

        Image.alpha_composite(image, new_img).save(img)


if __name__ == "__main__":
    text_pic = TestText()
    try:
        file_list = os.listdir(text_pic.pic_path) 
        for i in range(0, len(file_list)): 
            filepath = os.path.join(text_pic.pic_path, file_list[i])
            if os.path.isfile(filepath): 
                filetype = os.path.splitext(filepath)[1] 
                if filetype == '.png': 
                    text_pic.test_text(filepath) 
        print('批量添加水印完成')
    except:
        print('输入的文件路径有误，请检查~~')