[Gimp-user] Best way to upscale an image

[Helmut Jarausch <jarausch skynet be>]

Hi,
for a photobook I need to upscale an image (showing a landscape) by a  
factor of 2.
What are good (best?) methods to do so with Gimp, GMIC or other tools  
(I'd prefer
open source on a Linux machine)


I've read about neural network algorithms. Are they usable for larger  
(7MP) images without
enormous computer power?

Many thanks for your recommendation,
Helmut