ImageOperations php class

Hi!
I'm trying to use the ImageOperations php class in a project.
But, it seems to be not working. There is no error, just nothing happen with images.
I'm doing this:

$img = new Image();
$img->load('imagefolder/'.$filename);
$img->resizeToWidth(316);
$img->save('imagefolder/'.$filename);

The process seems to finish well, but the image has the original size.
Could you help me to make it work?

Thanks,
Tomas

call the images files with 'www/root/home' like abs path $_SERVER['DOCUMENT_ROOT'] use this in php it will give correct abs path

Thanks for your answer.
What you suggest is that I should use the full physical path?

yes