PHP class to re-size and scale images
If you want to scale image:
$image = new ImageResize('picture.jpg');
$image->scale(50);
$image->save('picture2.jpg')
If you want to resize image:
$image = new ImageResize('picture.jpg');
$image->resizeToHeight(500);
$image->save('picture2.jpg');
$image->resizeToHeight(200);
$image->save('picture3.jpg');