| Note "without sacrificing image quality" is kind of a relative thing. Pretty much by definition, any upsizing will reduce IQ - the question is, by how much? The "dumbest" upsizing algorithms will show more obvious artifacts (eg, edge become jagged lines, an overall "blocky" appearance); the "smartest" algorithms will show fewer. Ity all depends on how much you want to pay and hard you want to work at it, which in depends on your purpose. Really, if you are just going to hand the file off to a print service (eg, Mpix, Ritz, Costco, etc) to do, say, an 18x24" or 20x30" print, you don't *need* to upsize at all - their software can usually take care of it for you and do a pretty good job of it. |