Description:
------------
This problem seems isolated to the RedHat RPM package php-pecl-imagick.x86_64, as everything works flawlessly on my Gentoo workstation.

When initializing the Imagick class with a full URL, it somewhere is ignoring the protocol and appends a prefix of the local path to the URL passed.  Particularly this is happening at the point where the method thumbnailImage is being called.  No error output of any kind is being reported in the php debug log or in the Apache log files (other than an entry in the access_log file of Apache).  

Only when called using the CLI is any failure information available, which results in the following:

Fatal error: Uncaught exception 'ImagickException' with message 'unable to open image `/www/localhost/htdocs/http:/photo.wfrmls.com/mul640x480/1084661_15.jpg': No such file or directory @ blob.c/OpenBlob/2480' in /www/localhost/htdocs/test.php:3
Stack trace:
#0 /www/localhost/htdocs/test.php(3): Imagick->__construct('http://photo.wf...')
#1 {main}
  thrown in /www/localhost/htdocs/test.php on line 3


Notably you can see how in the constructor you can definitely see that the protocol definition is correct, yet in the error message thrown, you can see how it has changed the remote call to be a local path call by removing a forward slash - which of course doesn't exist and fails.

In the test script included, I get a blank page, with no errors of any kind anywhere.

Test script:
---------------
<?php 
$file = 'http://photo.wfrmls.com/mul640x480/1084661_15.jpg';
$img = new Imagick($file);
$img->thumbnailImage(100, 100, true);
header('Content-type: image/jpeg');
echo $img;
?>


Expected result:
----------------
Should see a scaled version of the image called at 100 pixels

Actual result:
--------------
Fatal error: Uncaught exception 'ImagickException' with message 'unable to open image `/www/localhost/htdocs/http:/photo.wfrmls.com/mul640x480/1084661_15.jpg': No such file or directory @ blob.c/OpenBlob/2480' in /www/localhost/htdocs/test.php:3
Stack trace:
#0 /www/localhost/htdocs/test.php(3): Imagick->__construct('http://photo.wf...')
#1 {main}
  thrown in /www/localhost/htdocs/test.php on line 3