Why Does ImageMagick Return \'Access Denied\' When Converting PDFs and How Can I Fix It?

ImageMagick Access Denied: Converting PDFs to Images

In this issue, a program utilizes the subprocess package to convert a PDF document to an image using ImageMagick. The user encountered an error indicating "not authorized `temp2.pdf'".

Diagnosis and Solution:

The error suggests that ImageMagick lacks the necessary authorization to access the PDF file. To resolve this issue, modify the ImageMagick policy.xml file.

Detailed Steps:

1. Locate the policy.xml file, which is typically found in the /etc/ImageMagick-6/policy.xml directory.
2. Uncomment the following line:

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

3. Change rights="none" to rights="read|write":

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

Additional Information:

This policy update was recently implemented due to a security flaw in the Ghostscript delegate. The flaw has been patched in the latest version of Ghostscript (9.25).

Note:

On certain systems, the policy line may specify domain="coder" instead of domain="module".

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