Question

How to sharpening an uploaded image in PHP ?

Is there some PHP libraries ? What is the best ?

Answer 1

ImageMagick offers best quality and lot of other features. Use adaptiveSharpenImage function:

<?php
try
{
    $image = new Imagick('image.png');
    $image->adaptiveSharpenImage(2,1);
}
catch(ImagickException $e)
{
    echo 'Error: ' , $e->getMessage();
    die();
}

header('Content-type: image/png');
echo $image;
?>