resizing images from database

[tito]

I know that image needs to be in file system so it could be resized with GD.
However I am able to getimagesize by simulating image display

getimagesize('http://site.com/image.php?id=xx');

I was wondering if there is a similar trick to simulate an image display in order to resize it? Or maybe to store it in a temp file (if so, how?)

Thanks

[nemonoman]

Get the image into a variable:

$row=mysql_fetch_array(mysql_query("SELECT image FROM table WHERE id=1"));
$size=getimagesize($row[0]);