so, just to clarify. Say I have an image that's 3x5 at 300 dpi. Will that "blow-up" to a crisp 3'x5' image at 100dpi? That's my big question, the actual, not theoretical application of the program. It's kind of hard to understand the real results without hearing (or seeing) them in real-life (terms).
I'd say "yes" to that question. You're only blowing up by about 400% (measured in linear pixels). I have used Genuine Fractals to make decent 48"x20" 300dpi prints for store POP
signs starting with 5"x2" 300 dpi images. That's close to a 1000% enlargement. I don't know anything about Alientool's gear, but if GF can do 1000%, Alientools can certainly do 400%. Nobody in the software biz is really immensely smarter than everyone else in the field.
The key is to start with a very clean, unprocessed source and do any sharpening after the enlargement. If the source file has already been heavily sharpened, or contains a lot of compression artifacts the software will misinterpret it as actual detail and blow up the crap along with the good.
Occasionally I've needed to blow up an image to some larger, but editable, size and use Photoshop to clean things up a bit before the final enlargement. Say a 250% enlargement, then a clean up, then a final 400% enlargement. If you blow it up to final print size first the file is often so huge its a real chore to edit unless you have god's own
computer. I've used this two-stage technique to make enlargements nearly 2000% -- from 5"x2" 150dpi to 48"x20" 300dpi . The results are nothing I'd want to hang in an art gallery but if you stand back 3 or 4 feet it looks OK.