python - 通过坐标提取 PDF 页面的区域

Question

我正在寻找一种工具来提取 1 页 PDF 文件的给定矩形区域(按坐标)并生成具有指定区域的 1 页 PDF 文件:

# in.pdf is a 1-page pdf file
extract file.pdf 0 0 100 100 > out.pdf
# out.pdf is now a 1-page pdf file with a page of size 100x100
# it contains the region (0, 0) to (100, 100) of file.pdf

我可以将 PDF 转换为图像并使用 convert，但这意味着生成的 PDF 将不再是矢量的，这是 Not Acceptable (我希望能够缩放)。

理想情况下，我希望使用命令行工具或 Python 库来执行此任务。

谢谢!

Answer 1

使用 pyPdf ，你可以这样做:

import sys
import pyPdf

def extract(in_file, coords, out_file):
    with open(in_file, 'rb') as infp:
        reader = pyPdf.PdfFileReader(infp)
        page = reader.getPage(0)
        writer = pyPdf.PdfFileWriter()
        page.mediaBox.lowerLeft = coords[:2]
        page.mediaBox.upperRight = coords[2:]
        # you could do the same for page.trimBox and page.cropBox
        writer.addPage(page)
        with open(out_file, 'wb') as outfp:
            writer.write(outfp)

if __name__ == '__main__':
    in_file = sys.argv[1]
    coords = [int(i) for i in sys.argv[2:6]]
    out_file = sys.argv[6]

    extract(in_file, coords, out_file)