I haven't tried this filter but the examples I saw didn't seem to look
any better than what you can get with Photoshop, for example these two
pages using older versions of Photoshop ...

http://www.fredmiranda.com/SI/
http://www.americaswonderlands.com/digital_photo_interpolation.htm

Roger Clark has a page on upsamping using "Adaptive Richardson-Lucy
Iteration" and feels that works the best ... you can download the fox
image snippet and run your software and see if you get something as
good or better ... when I did this using just Photoshop and my normal
three-step workflow (which includes two sharpening passes) that I use
for printing Roger thought it looked about as good what he gets with
R-L, except instead of taking 90 minutes to run I could do it in 3
minutes ... at any rate if you can beat his example Roger would like to
see it.  This is useful info because it's a standardized image.
http://www.clarkvision.com/imagedetail/image-restoration1/index.html

Note that different methods might give better or worse results
depending on the image (and the operator if sharpening is included).
For example here's a test (by someone selling GF, just as the guy
selling a Stair Interpolation action came up with an image that looks
good upsized using SI) that shows GF is better than Photoshop, at least
for this image ... http://www.inkjetart.com/news/gf/ ... but it's
irrelevant to me because they rasterized a vector image and then ran
the tests and none of my images are vector-like images.  Few photos
are.

Bill

It appears to be a Windows program having nothing to do with
photography.

Serious artists use Macs. :-)

This thread has to do with digitaly up-sizing images without pixelation
problems.  You can get a clear reading about it on the product page here:
http://www.ononesoftware.com/ ... though there are other resources
that have been mentioned in this thread.  For you, this might be a good
idea to attain printing size perfection for yourself, and you fractal art.