[Panelfantastic]

I'm camera illiterate so easy on all the technospeak.
I've got an old Sony DSC-S70. Junk. Takes a decent picture but is not simple to operate. My question is this... If I take a picture and try to blow it up at all after I get it downloaded, it gets grainy and pixelated almost immeadiately, regardless of which image size I use (640 all the way up to 2048).
Is this just how it is or am I overlooking something?


Jeff-