Увеличение картинки со сглаживанием.

                        
<?php  

$from = imageCreateFromJpeg("sample2.jpg");   

$to   = imageCreateTrueColor(2000, 2000);   

imageCopyResampled(  

  $to, $from, 0, 0, 0, 0, imageSX($to), imageSY($to),   

  imageSX($from), imageSY($from)  

);   

header("Content-type: image/jpeg");  

imageJpeg($to);  

?>