no... you don't understand...
I want do a image whit more quality, NOT a bigger image.
Look at my background of youtube..
http://www.youtube.com/user/SenzaCanale
Then, look this background http://www.youtube.com/user/UKFDubstep
The quality is bigger in the second background.. i want do a image whit same quality, using paint.net
Is this impossible?