pip install pillow

pip install PyMuPDF

from PIL import Image
import os
import io
import fitz
import time


def single_pdf_clearwater(pdf_path: str):
    pdf = fitz.open(pdf_path)   # 打開pdf目錄
    pdf_img = fitz.open()       # 打開空文件，用來存圖片pdf
    for page_inf in pdf:
        definition = 3    # 清晰度，感覺輸出的pdf不夠清晰，可以調(diào)大，調(diào)大，文件大小也會變大
        matrix = fitz.Matrix(definition, definition)
        img = page_inf.get_pixmap(matrix=matrix).tobytes()
        img = Image.open(io.BytesIO(img))
        width, height = img.size
        for i in range(width):
            for j in range(height):
                if sum(img.getpixel((i, j))) > 600: # 這里的600你需要根據(jù)自己的水印的顏色進行更改。
                    img.putpixel((i, j), (255, 255, 255))
        img = img.tobytes()  # = img = np.asarray(img)；img = bytearray(img)
        img = fitz.Pixmap(fitz.csRGB, width, height, img)
        img = img.tobytes()
        img = fitz.open("png", img)
        pdf_bytes = img.convert_to_pdf()
        pdf_img.insert_pdf(fitz.open("pdf", pdf_bytes))
    if not os.path.exists("output"):
        os.makedirs("output")  # 處理好的pdf存入了output目錄下
    pdf_img.save("output/去水印pdf_" + os.path.basename(pdf_path))


def group_pdf_clearwater(path_array: list[str]):
    print("************去水印時間比較久***********")
    for pdf_path in path_array:
        print(pdf_path, "去水印中...")
        single_pdf_clearwater(pdf_path)
    print("完成")


def folder_pdf_files(folder: str) -> list[str]:  # 一個文件夾里面有多少pdf文件
    file_list = []
    for a, b, c in os.walk(folder):
        if b == []:
            for filename in c:
                if filename[-3:].lower() == 'pdf':
                    file_path = os.path.join(a, filename)
                    file_list.append(file_path)
    print(folder, ": 有", len(file_list), "個pdf文件")
    return file_list


if __name__ == '__main__':
    time_start = time.time()
    path_list = folder_pdf_files("pdf的目錄")
    group_pdf_clearwater(path_list)
    time_end = time.time()
    print("程序運行時間：", round(time_end - time_start, 2), "秒")