(PECL imagick 2.0.0)
Imagick::roundCorners — Rounds image corners
Rounds image corners. The first two parameters control the amount of rounding and the three last parameters can be used to fine-tune the rounding process. This method is available if Imagick has been compiled against ImageMagick version 6.2.9 or newer.
x rounding
y rounding
stroke width
image displace
size correction
Example #1 Using Imagick::roundCorners():
Rounds the image corners
<?php
$image = new Imagick();
$image->newPseudoImage(100, 100, "magick:rose");
$image->setImageFormat("png");
$image->roundCorners(5,3);
$image->writeImage("rounded.png");
?>
Returns TRUE on success.