Image_Lib : Saving Thumbnail to another directory?

[eluser]garaget[/eluser]
Hey guys,

I am somewhat of a nub to using this library. I see the way to set the source of the file you want to work on but I don't see anyway to set the directory or file that I want to write the file to?

//Source file

Code:

$config['source_image'] = 'directory/directory/file.jpg';

Is there a config setting where I can set where the file is going to?

Thank you for your time and efforts in advance.