Certain commands executed via PHP shell fail

[davidenco]

This issue occurs with versions 6.9.1-6, 6.9.1-7, 6.9.1-8, 6.9.1-9 and 6.9.1-10. The problem does not occur with 6.9.1-4.

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CentOS 6.7 x64
PHP 5.5.28
GPL Ghostscript 9.16 (2015-03-30)
ImageMagick 6.9.1-6 Q16 x86_64 2015-06-25

I need to convert a PDF to an image as follows:

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<?php
echo shell_exec('/usr/local/bin/convert -density 300 /path/to/file.pdf -resize 25% -compress lossless -quality 0 /path/to/file.jpg');
?>

However the output from this command is:

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Unknown device: pamcmyk32
Unrecoverable error: undefined in .uninstallpagedevice Operand stack:
    defaultdevice

If I execute the exact same command via SSH, it works! But why?!

[snibgo]

Is it running the same version of Ghostscript?

[davidenco]

Yes, Ghostscript didn't change throughout the different ImageMagick versions.