stormchaser - yes its true you can increase scale dramatically in photoshop. There are other threads on this - this is the only one i can find quickly - http://www.renderosity.com/mod/forumpro/showthread.php?thread_id=2685598. There is is various software I use - eg perfect pixel - and also one of the best methods is supposed to be using the photoshop scaling but increasing each time only by 10% until you reach the desired size (rther than in one go - I am told by experts that this is the best way to increase sizes. But the trick is to start of with as big files as possible.