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PHP Ghostscript error, but command line works fine (decoding pdf to png)

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Solution:

Looks to me like you are using a build of Ghostscript which uses shared libraries, and the system can't find the libtiff 8 dynamic library.

You appear to have libtiff 5 installed, you need libtiff 8. Presumably libtiff 8 is installed for your user, but not the PHP user which is why it works for you from the command line.

Or you can use a build of Ghostscript which doesn't use shared libraries, but that will mean building it yourself as it looks like the packager for your distro has chosen to use shared libraries.

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