Exporting SD to HD via imovie quicktime, what is end result?

I am using imovie with youtube...
My camcorder is SD (not HD). However, I have read how you can export to HD using quicktime, and imovie will let you export SD to HD. So, what is the end result? Does it "fill in" the missing data to give you something close to HD? Will YouTube view it as HD even though it is not truely HD?
I actually would have expected imovie to NOT let you export SD to HD, since there is not enough data to be true HD; that is the reason for my questions.
Thanks
bob

You'll end up with a very soft looking movie as Quicktime as to interpolate the missing pixels to give you the desired resolution. There is no way to make SD content look like HD. Some upscaling DVD players do a surprisingly good job, but they still have to create the missing pixels.
I don't know if you've ever worked with Photoshop or if you've done much printing, but think of printing a low res 72 dpi image you get off the web. If you try to print a web image as a 4 x 6 on photo paper using a decent inkjet the print will look blocky and lack sharpness. It's kind of like that.

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