In the meantime, I have an example I'm willing to share. It's of a ship, but one rather unlike the modern superyachts that Nicolas tends to shoot (amongst various other subjects).
It's of a replica of a Dutch VOC merchant ship, The Batavia, from 1628 that was shipwrecked on its maiden voyage off the coast of West-Australia during a storm. The ship was rebuilt in the Netherlands, from 1985-1995, amongst others as a project to preserve knowledge about old craftsmanship. Almost all tools and materials used were the same as the ones used at the time. Materials such as ropes, and the wooden ornaments and tools, were all (re)made with traditional techniques on the shipyard itself.
The base image is one that I produced while researching optimal resampling techniques, and it is a vertical panorama, downsampled to 30% of its original stitched size. That means that I could produce even higher resolution output if I wanted to. But this downsampled version has lots of intricate detail to challenge the A.I. because there is now plenty of detail that's smaller/narrower than a single pixel. So that could become interesting to see what AIG makes of that.
https://www.dropbox.com/s/kpps4axc14itsao/0920_Tr_30pct.jpg?dl=0
From that, I upscaled two versions with the AIG version 1.1.0, because while my graphics card is on the "not-supported hardware list", Topaz added a switch to that version, allowing more CPU processing and less GPU processing in order to enable more machines with older hardware to still use the application, albeit at a much slower pace.
I also made these two upscaled versions available to allow others who cannot get the software working, to still be able and judge what AIG is capable of with this type of subject matter. It might convince them to invest (again) in more powerful hardware, which is going to be more expensive than the software.
The two versions are compressed TIFFs at 300% and 600% upscaling.
https://www.dropbox.com/s/jhr74lruhcss4cu/0920_Tr_30pct_Gpx110Mod300pct.tiff?dl=0 (28.8 MB filesize!)
https://www.dropbox.com/s/wp6ji82ab376wtl/0920_Tr_30pct_Gpx110Mod600pct.tiff?dl=0 (93.5 MB filesize!)
Both of these resulting files have not yet been sharpened, only upscaled by Topaz A.I. Gigapixel with the "Moderate" setting for "Reduce Noise and Blur".
This also raises an interesting dilemma for the protection of copyright on images that are posted on the internet. It was already difficult to avoid people stealing images, it has just become much more difficult to protect, but also for image banks with stock photography that will start selling the cheaper/smaller versions because the customers can rescale them themselves for the purpose they needed them for in the first place.
Cheers,
Bart