Description:
------------
The following command places the watermark.png nicely in the lower right corner of original.jpg:
composite -gravity SouthEast -geometry "+0+0" 'watermark.png' 'original.jpg' 'output.jpg'

Trying the to get the same result with Imagick fails, though:
<?php

$wm = new Imagick( 'watermark.png' );
$im = new Imagick( 'original.jpg' );
$im->setImageGravity( Imagick::GRAVITY_SOUTHEAST );
$im->compositeImage( $wm, Imagick::COMPOSITE_DEFAULT, 0, 0 );
$im->writeImage( 'output.jpg' );

?>

Doing a <?php var_dump( Imagick::GRAVITY_SOUTHEAST, $im->getImageGravity() ); ?> gives me ?int 9, int 9? - which tells me the gravity is set properly.

Thus I guess compositeImage() simply ignores the gravity attribute.

Some info from phpinfo():
imagick module version: 2.3.0 
ImageMagick version: ImageMagick 6.6.0-0 2010-03-02 Q16


Reproduce code:
---------------
<?php

$wm = new Imagick( 'watermark.png' );
$im = new Imagick( 'original.jpg' );
$im->setImageGravity( Imagick::GRAVITY_SOUTHEAST );
$im->compositeImage( $wm, Imagick::COMPOSITE_DEFAULT, 0, 0 );
$im->writeImage( 'output.jpg' );

?>

Expected result:
----------------
watermark.png placed in bottom right corner on top of original.jpg

Actual result:
--------------
watermark.png placed in top left corner on top of original.jpg