Třeba
<?php
$holder = imagecreatetruecolor($newWidth, $newHeight);
imagecopyresampled($holder, $resource, 0, 0, 0, 0, $newWidth, $newHeight, $oldWidth, $oldHeight);
imagejpeg($holder, $path, $quality);
Třeba
<?php
$holder = imagecreatetruecolor($newWidth, $newHeight);
imagecopyresampled($holder, $resource, 0, 0, 0, 0, $newWidth, $newHeight, $oldWidth, $oldHeight);
imagejpeg($holder, $path, $quality);