A question about Image resising using software?

Question

Whenever we have a big image, we can make it small using softwares like frontpage or photoshop etc. and the said picture retains its quality even after becoming small or resizing. But whenever we try to make a small image big we begin to see quality dropping beyond 15 to 20 % increase from the orignal size of the image. My question is is there any free software available which can increase image size by 100% or more without any reduction in quality or whithout the pcture becoming fuzzy. PS : dont give me reference to -

http://www.lonking.com/resize-pictures. its more horrible than what I can currently do with my softwares.

Answer 1

It's not possible.  In order to make your picture bigger, the software has to "invent" pixels that aren't in the original image.  The bigger you make the picture, the worse the software gets at guessing what color the invented pixels should be.  Making an image smaller, is just a matter of discarding (more or less) certain pixels.  Since the image is getting smaller you don't notice the missing pixels.