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Originally Posted by Tannin
OK, I'll bite on that one. Assume, for the moment, equal detail in your JPEG and your raw (and for that matter your BMP and your PNG and your TIFF) versions of the image. So far as detail goes, you cannot get a better upres from any of those formats than you get from any of the other formats - the information that is contained in the image is the information that is contained in the image. End of story.
The real question, then, is do the different image versions contain equal detail or not?
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Its a difficult one innit
Personally I think your original premis is flawed. A jpeg file does not necessarilly contain the same detail, as we know up to 75% of the pixels have been chucked away, only to be put pack as a best guess when reopened.
If you upsize this then logically you are in theory interpolating data that wasn't in the original file. Upsizing during the raw conversion is, it seems to me, interpolating data that the camera created and recorded, and consequently it follows that potentially it will retain more detail.
I suppose an alternative method would be to convert to a TIFF then upsize from that. I really don't want to get into the physics of it too much though. I'm more bothered about what works for me, I'm not suggesting that all 6mp raw files should be upsized as a matter of course, that would be a nonsense. Fujifilm of course designed cameras round the principle