Imagick::quantizeImage

<?php
function quantizeImage($imagePath, $numberColors, $colorSpace, $treeDepth, $dither) {
    $imagick = new \Imagick(realpath($imagePath));
    $imagick->quantizeImage($numberColors, $colorSpace, $treeDepth, $dither, false);
    $imagick->setImageFormat('png');
    header("Content-Type: image/png");
    echo $imagick->getImageBlob();
}

?>