Description:
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imagick 3.0.1RC1
RedHat Enterprise Linux 5.5
PHP 5.1.6
ImageMagick 6.2.8.0

When using Imagick::newPseudoImage to create a radial gradient, this error appears in the Apache HTTP error log and the radial gradient is not created:

PHP Fatal error:  Uncaught exception 'ImagickException' with message 'Unable to create new pseudo image: radial-gradient:#FF0000-#FFFFFF' in /var/www/html/energy/scripts/rg.php:6\nStack trace:\n#0 /var/www/html/energy/scripts/rg.php(6): Imagick->newpseudoimage(150,150, 'radial-gradient...')\n#1 {main}\n  thrown in /var/www/html/energy/scripts/rg.php on line 6

The documentation at http://us.php.net/manual/en/function.imagick-newpseudoimage.php is lacking but according to http://www.imagemagick.org/script/formats.php (search for "radial"):

"RADIAL_GRADIENT...Gradual radial passing from one shade to
another...Returns a rendered radial gradient image using the specified image size. Specify the desired shading as part of the filename (e.g. radial-gradient:red-blue or radial-gradient:#F00-#00F)."

I've tried using "RADIAL_GRADIENT" instead of "radial-gradient" and every other combination I could think of.

Utimately, I would like to feed Imagick::newPseudoImage RGB values instead of hex and save the created images to disk.

Reproduce code:
---------------
<?php
       // Create a new imagick object.
       $image = new Imagick();

       // A new image with radial gradient fading from red to white, 150 by 150 pixels.
       $image->newPseudoImage(150,150,'radial-gradient:#FF0000-#FFFFFF');

       // Set the image format to PNG.
       $image->setImageFormat('png');

       // Output the image.
       header("Content-Type: image/png");
       echo $image;
?>

Expected result:
----------------
A radial gradient image in PNG format should be displayed in the web browser.

Actual result:
--------------
The script returns nothing and logs a fatal error in the Apache HTTP log (see description for details).