我想要以 300 DPI 垂直和水平分辨率和压缩格式将 PDF 提取为 Tiffs + CCITT T1.6

Question

这是代码：

import os
from PIL import Image
import fitz

def pdf_to_tiffs(pdf_path, output_folder):
    # Check if the output folder exists, and create it if it doesn't
    if not os.path.exists(output_folder):
        os.makedirs(output_folder)

    # Open the PDF file
    pdf_document = fitz.open(pdf_path)

    # Determine the number of digits needed for numbering the pages
    num_pages = len(pdf_document)
    num_digits = len(str(num_pages))

    # Convert each page to TIFF with the desired settings
    for i in range(1, num_pages + 1):
        page = pdf_document[i - 1]  # Adjust index to start from 0
        pix = page.get_pixmap()
        # Convert pixmap to Pillow Image
        img = Image.frombytes("RGB", [pix.width, pix.height], pix.samples)

        # Set DPI (dots per inch)
        img_info = img.info
        img_info['dpi'] = (300, 300)

        # Generate filename with leading zeros based on the maximum number of pages
        filename = f"page_{str(i).zfill(num_digits)}.tif"

        # Save image with CCITT T.6 compression
        tiff_path = os.path.join(output_folder, filename)
        img.save(tiff_path, compression='tiff_ccitt', dpi=(300, 300))

    pdf_document.close()

# Example usage
pdf_to_tiffs("C:\\Users\\ftp\\flask\\output\\90000026.pdf", "C:\\Users\\ftp\\flask\\output")

Tiff 的提取是完美的，但我无法进行压缩

CCITT T1.6

以及垂直和水平 300 DPI。

Answer 1

Python 依赖项通常包括 Pillow 等应用程序中的 GhostScript。

所以这只是一个一行程序

gs -sDEVICE=tiffg4 -r300 -oAnswer.tiff question.pdf

如果您想要单个图像而不是 T6 文件，请作为单页传输。

bin\gs -sDEVICE=tiffg4 -r300 -oAnswer%4d.tiff question.pdf