Interpolation Types:



Hybrid - Very smooth, very detailed, minimal artifacts, and relatively fast, this is the #1 choice for most jobs.
Hybrid SE (only available in Studio Edition) - Same as Hybrid except a bit smoother and completely artifact free.
Vector - Offers very smooth edges, good sharpness, and low noise. As fast as Lanczos with less noise/artifacts and better edges.
Pyramid - Even smoother than vector interpolation. Pyramid does a great job with "big stretches". Also the slowest method.
Lanczos - A little sharper than vector interpolation, but at the expense of more noise and more jagged edges.
Hermite - While faster than vector or Lanczos interpolation, Hermite is not as sharp and also has more noticeable jagged edges.
Mitchell - Good sharpness and detail, but not as capable of eliminating jaggies as some of the other interpolation schemes.
Bicubic Spline - Produces smooth edges but also produces results that look soft.
Triangle - Offers a good balance between calculation speed and quality, but leaves some jagged edges behind.
Bell - Relatively fast, but produces a soft image.
Pixel Resize - Simply stretches the image to the new size. This is the fastest option but has the least smoothing.

... and Fusion which is newer, beats the pants off of them all by a lot.

Fred

Yes, that is as good as it gets.
You even have a slider in EDIT PREFERENCES, INTERPOLATION, that allows you to adjust the anti aliasing to suit you, for less or zero artifacts when downsampling.
You will love your Qimage even more when you see more "stuff" built in
Fred

One more item.... those other interpolators like Vector, etc. have specialized purposes.
Some favor line drawings better that others.
Example: If you ever want to print a target for profiling, Qimage has a target printing setup all done for you. When you invoke it, it selects Vector as the interpolator.

Fred