As you are discovering, QU can be a "one-stop-shop" and makes other software redundant.
Terry
Hi Roger,
Just had to add to Terry's excellent explanation.
Realizing that you are asking about UP sampling more than Down Sampling, I still thought you might find it interesting to see a feature that Qimage has embedded in the bowels of her ship related to Down sampling.
This is versatility for a discerning person like yourself who can appreciate the subtle quality adjustment available.
If you click EDIT, Preferences, and then select the top choice, Interpolation, (see snap), you can adjust the anti aliasing for more or less (to taste) for your down sampling.
These are special algorithms written by Mike, the author, that make the best quality down sampled images, and allows you to tweak it to a higher degree of your standards.
More Antialiasing, less chance of an artifact. Less antialiasing, sharper image, but with a chance of some artifact possible, depending on the type of image subject.
Just thought you would appreciate some of the sophisticated abilities of Qimage Ultimate.
I am enjoying your discussion.... except I already know the winner.!!
Fred