I opened up one of my own files in PixelClarity. It's hard to understand how exactly to use this.
After clicking on "reinterpolate image" in this program, the left-side screenshot looks much better than the right-side original.
Right now, what you have is just a tech demo; I put it up to get feedback on the quality of the interpolation algorithms I'm using for upsizing and downsizing. It doesn't have a save option enabled yet. The goal is for the resized image to be as sharp as possible with the least aliasing regardless of the rescaling percentage.