safe mode On and imagick problem

[fumnimda]

hi all,
i install imagick for php on my server but when i use :

$im = new Imagick();
$im->readImage($file);

i get this error : Fatal error: Uncaught exception 'ImagickException' with message 'Safe mode restricts user to read image.
safe mode is On on my server and it must be so for security reasons.

what can i do for resolving this issue? why safe mode On cause this problem?

thanks alot.