PHP+Image: Image Better Quality Filter

image-better-quality.php

$img_r = imagecreatefromjpeg($src);
	
imagefilter($img_r, IMG_FILTER_BRIGHTNESS, 5);
imagefilter($img_r, IMG_FILTER_CONTRAST, -10);

$sharpenMatrix = array 
        ( 
            array(-2, -1, -2), 
            array(-1, 40, -1), 
            array(-2, -1, -2) 
        ); 

// calculate the sharpen divisor 
$divisor = array_sum(array_map('array_sum', $sharpenMatrix));            

$offset = 0; 

if($w < 1200){
	// apply the matrix 
	imageconvolution($img_r, $sharpenMatrix, $divisor, $offset);
}