title: ImageMagick not authorized to convert PDF to an image
body: <p>I have a program, in which I need to convert a PDF to an image using Image Magick. I do that using the <code>subprocess</code> package:</p>
  
  <pre><code>        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')
  </code></pre>
  
  <p>The error I got is:</p>
  
  <pre><code>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 &lt;module&gt;
      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'
  </code></pre>
  
  <p>The most important of which is:</p>
  
  <pre><code>convert-im6.q16: not authorized `temp2.pdf' @ error/constitute.c/ReadImage/412.
  </code></pre>
  
  <p>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.</p>