my $obj_temp = $objImageMagick->Read("foo.jpg","bar.jpg");
if ("$obj_temp") {
	$obj_temp =~ /(\d+)/;
	warn "Error Number $1, number of images read: ".(0+$obj_temp);
	# handle the error further, like maybe "die"
}

##</code><code>##

Error Number 435, number of images read: 1 at ....