PHP GD sharpness filter

Question

How can you make a sharpness filter with the PHP GD library?

So that this...

Answer 1

If the ImageMagick is installed in your PHP config, you can use Imagick::adaptiveSharpenImage

From the manual:

adaptiveSharpenImage(2,1);
} catch(ImagickException $e) {
    echo 'Error: ' , $e->getMessage();
    die();
}
header('Content-type: image/png');
echo $image;
?>

http://php.net/manual/en/function.imagick-adaptivesharpenimage.php