Maybe Gimp has just rotted my brain over the years with its UI...
So I can see going from Gimp to a more standard interface being difficult, if Gimp is what you're used to. Conversely so many people hate using Gimp because of the same reason if they're used to Photoshop
On top of that, I downloaded Krita again, and the UI seems more approachable than I remember. Don't know what's up with that, maybe there was some freak misconfiguration last time I tried. Ah well.
Kind of wondering what kind of image would be 30GB... :)
* https://openslide.org/formats/aperio/
* https://web.archive.org/web/20120420105738/http://www.aperio...
Pages 14 onward give the info. Seems like it's a variation of TIFF, in tiled format.
Main tile (image) size is 120k x 80k. That's huge!
29GB when saved uncompressed. I'd hope most applications would use the optional compression features. :)