Example

function setTextAntialias($fillColor, $backgroundColor)
{
    $draw = new \ImagickDraw();
    $draw->setFont(__DIR__ . "/../../../fonts/Arial.ttf");
    $draw->setStrokeColor('none');
    $draw->setFillColor($fillColor);
    $draw->setStrokeWidth(1);
    $draw->setFontSize(32);
    $draw->setTextAntialias(false);
    $draw->annotation(5, 30, "Lorem Ipsum!");
    $draw->setTextAntialias(true);
    $draw->annotation(5, 65, "Lorem Ipsum!");

    $imagick = new \Imagick();
    $imagick->newImage(220, 80, $backgroundColor);
    $imagick->setImageFormat("png");
    $imagick->drawImage($draw);

    //Scale the image so that people can see the aliasing.
    $imagick->scaleImage(220 * 6, 80 * 6);
    $imagick->cropImage(640, 480, 0, 0);

    header("Content-Type: image/png");
    echo $imagick->getImageBlob();
}