Postscript delegate failed for ImageMagick PHP library

For ImageMagick in PHP through the library Imagick the following error may occur for versions ImageMagick-6.3.5 to ImageMagick-6.4.2:
Postscript delegate failed `': No such file or directory

This is a bug and the error appears when one is trying to use the readimageblob function to read a PDF file.

The fix has been posted and the bug is no longer present. See http://www.imagemagick.org/discourse-server/viewtopic.php?f=3&t=11989. So to fix it get the latest release from http://www.imagemagick.org/.

Some installations (like server environments), haven't got the latest version and cannot install it. For these, it is possible to work around this bug, by using a temp file.

So instead of:
$im = new Imagick();
$im->readimageblob($data);

Use:
$im = new Imagick();
$temp = tmpfile();
fwrite($temp, $data);
fseek($temp, 0);
$im->readimagefile($temp);
fclose($temp);

(This would typically be followed by for example:
$im->setImageFormat("png");
$data = $im->getimageblob();)

Sources: http://markmail.org/message/6mg3lxi26gd5fluv#query:readimageblob%20Postscript%20delegate%20failed+page:1+mid:6mg3lxi26gd5fluv+state:results

If this doesn't fix it for you, also check out: http://stackoverflow.com/questions/588918/imagemagick-imagick-convert-pdf-to-jpg-using-native-php-api