Need help: filter pixelation and compression artefacts on upscale

[Chocobo]

Thanks for the response.

Okay, I will ask the artist next time to:

-try 1200dpi but also do a 600dpi version if the 1200dpi is interpolated
-go for tiff
-set to 16 bit if possible

If it is a usual scanner anything higher than 1200dpi is unlikely to be supported?