ImageMagick 无权将 PDF 转换为图像

问题描述

我有一个程序，我需要在其中使用 Image Magick 将 PDF 转换为图像.我使用 subprocess 包来做到这一点:

I have a program, in which I need to convert a PDF to an image using Image Magick. I do that using the subprocess package:

        cmd = 'magick convert -density 300 '+pdfFile+'['+str(rangeTuple[0])+'-'+str(rangeTuple[1])+'] -depth 8 '+'temp.tiff' #WINDOWS
        if(os.path.isfile('temp.tiff')):
            os.remove('temp.tiff')
        subprocess.call(cmd,shell=True)
        im = Image.open('temp.tiff')

我得到的错误是:

convert-im6.q16: not authorized `temp2.pdf' @ error/constitute.c/ReadImage/412.
convert-im6.q16: no images defined `temp.tiff' @ error/convert.c/ConvertImageCommand/3258.
Traceback (most recent call last):
  File "UKExtraction2.py", line 855, in <module>
    doItAllUpper("A0","UK5.csv","temp",59,70,"box",2,1000,firstPageCoordsUK,boxCoordUK,voterBoxCoordUK,internalBoxNumberCoordUK,externalBoxNumberCoordUK,addListInfoUK)
  File "UKExtraction2.py", line 776, in doItAllUpper
    doItAll(tempPDFName,outputCSV,2,pdfs,formatType,n_blocks,writeBlockSize,firstPageCoords,boxCoord,voterBoxCoord,internalBoxNumberCoord,externalBoxNumberCoord,addListInfo,pdfName)
  File "UKExtraction2.py", line 617, in doItAll
    mainProcess(pdfName,(0,noOfPages-1),formatType,n_blocks,outputCSV,writeBlockSize,firstPageCoords,boxCoord,voterBoxCoord,internalBoxNumberCoord,externalBoxNumberCoord,addListInfo,bigPDFName,basePages)
  File "UKExtraction2.py", line 542, in mainProcess
    im = Image.open('temp.tiff')
  File "/home/rohit/.local/lib/python3.6/site-packages/PIL/Image.py", line 2609, in open
    fp = builtins.open(filename, "rb")
FileNotFoundError: [Errno 2] No such file or directory: 'temp.tiff'

其中最重要的是:

convert-im6.q16: not authorized `temp2.pdf' @ error/constitute.c/ReadImage/412.

我认为这是因为 ImageMagick 无权访问 PDF.现在应该怎么做?我在 Linux 服务器上.任何帮助表示赞赏.

I think this is because ImageMagick isn't authorized to access the PDF. What should be done now? I'm on a Linux server. Any help is appreciated.

推荐答案

emcconville 是正确的.更具体地说，编辑 Imagemagick policy.xml 文件以取消注释此行:

emcconville is correct. More specifically edit the Imagemagick policy.xml file to uncomment this line:

  <!-- <policy domain="module" rights="none" pattern="{PS,PDF,XPS}" /> -->

并将其从 rights="none" 更改为 rights="read|write"

And change it from rights="none" to rights="read|write"

  <policy domain="module" rights="read|write" pattern="{PS,PDF,XPS}" />

我相信，这是由于 Ghostscript 委托中发现的安全漏洞而最近添加到 policy.xml 文件中的.我认为这个缺陷现在已经在 Ghostscript 的当前版本 9.25 中修复了.

This was a recent addition to the policy.xml file, I believe, due to a security flaw found in the Ghostscript delegate. I think that flaw has now been fixed in the current version of Ghostscript, which is 9.25.

注意:在某些系统上，策略行将包含 domain="coder" 而不是 domain="module"

NOTE: On some systems the policy line will have domain="coder" rather than domain="module"

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