Is it viable to use Aperture to upsize images?

Hi All,
I have recently needed to produce some larger JPEGS (for lab printing) so have used Aperture 2's export functionality to produce 10x8 JPEGS (300dpi). It seems that Aperture will happily upsize my images, some of which are small-ish selective crops.
My question for anyone who has the relevant experience is how sophisticated is the algorithm that Aperture uses to perform this upsizing?
Currently I don't have Photoshop (otherwise I would use bicubic option), neither do I have any specialist resizing software like Genuine Fractals. Does using Aperture to perform this upsizing produce comparable results? Would you say that upsizing in Aperture is a viable tool? Or is it more like a primitive last resort?
Looking at my output, there appears to be some artifacts in some images but without reference to images produced by other programs, I cannot identify whether this is because of Aperture's algorithm or whether my original image is just too small.
Any advice much appreciated.
Brian

It would be preferable to let the printer driver, or better yet a RIP if you have one, to upscale the file for the printer. Print labs hate it when they receive upscaled images, because it's rarely done right and their RIP will do it perfectly. If you need to, and don't have upsizing software, in Photoshop (or GIMP or Pixelmator), you can upscale and make subtle sharpening adjustments (best done in the Lab Color Space luminance channel) to avoid artifacts and halos.
- Bert Pasquale
LifeStoryImages.com

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