Thanks For the answer,

In my testing I was upsizing a Zone Plate File (256 px by 256 px) to 7 inches by 7 inches in q-image.   I tested the Vector and Hybrid SE also with this file but found that for this type of file,   The Lanczos performed much better.   

I compared the results from Q image to a print made by manually upsizing in Graphic converter to 360pp and 720ppi using Lanczos 3 and Lanczos 5.    Out of all the prints the one from Q Image was quite a bit better.   (all of the prints where much better that upsizing in photoshop with Bi-Cubic)

Since I had no sharpening applied they should have been the same. 

I am glad that the Q-Image print was better but it should not have been.  The edges of the concentric circles in the zone plate looked very much as if they had been slightly blurred and then sharpened.   Don't get me wrong,  It looks produced the best print and I am glad but visually it was obvious that there was some improvement made that was beyond simply using lanczos to interpolate.

I am using an Epson 3880 in this test but also have an Epson 7880.   I am doing printing for an engineering company that needs several drawings of mechanical parts printed.  The drawings are old and low resolution. 

I am testing out Q-Image and have found that the Lanczos setting works best for what I am doing (I use lanczos in another program currently) but It looks as though the Lanczos setting is applying both a blur and a sharpen to an Image.

I am mainly looking at q-image for the template features but there seems to be a couple of extra things going on in the print process.  I don't necessarily object but I would like to know what effects are being applied to my image.   

I am judging only from the prints and would like to know the following if possible:

What Lanczos are you using ?   3, 5, 8 ?

Are you applying a Gaussian blur and unsharp mask automatically ?

In the print quality challenge on your website you state that 720 is the native resolution for Epson Drivers but in Q-Image ultimate the max setting is 360 PPI.   Is 360 enough since it is easily divided in to 720 (thus no rounding errors)

Thanks,   I appreciate your time and also very much appreciate that you have a fully functional demo.  I like what I am seeing so far.