To my eye, this isn't so. What I've found is that the differences between methods of up-resing are more visible at 600 ppi. Using GF (or QImage on PC?) instead of bicubic smoother to get to 600 ppi & printing at 600 ppi yields the best results, as I see them.
An uncroppped 5D print on 17x22 paper looks OK if the file is res-ed-up with bicubic smoother to 300 ppi & the print is made at 300 ppi.
It looks better in terms of sharpness & tonal transitions - & consequently a small but interesting subjective sense of depth in the print - if the print is up-resed to 600 ppi with bi smoother & printed at 600 ppi.
It looks even better if the print is up-resed to 300 ppi in Genuine Fractals & then the printer converts to 600.
(No doubt res-ing-up in GF to 600 ppi would be even better, but my computer is too elderly to do this in a reasonable period of time. Since my computer is a Mac, I can't say for sure about QImage, but I assume QImage would match or better the GF results.)
These are eyeball conclusions - things visible in prints that size - not just loupe-peeping.
My guess is that opinions vary with how large a print the opinion-holder is accustomed to making.
Kirk
