Fatal error: Uncaught exception 'ImagickException' with message 'unable to open image `/tmp/test.jpg':  @ error/blob.c/OpenBlob/2590' in /usr/share/doc/php5-imagick/examples/watermark.php:15
Stack trace:
#0 /usr/share/doc/php5-imagick/examples/watermark.php(15): Imagick->readimage('/tmp/test.jpg')
#1 {main}
  thrown in /usr/share/doc/php5-imagick/examples/watermark.php on line 15