[Gimp-user] How to export jpeg without loss of quality?

[Rodolfo Medina <rodolfo medina gmail com>]

Hi all Gimp users.

I'm new to Gimp.  I need rescaling and resizing a jpeg picture.  But, after
rescaling and resizing it with Gimp, and after exporting it as jpeg format, the
size of the output file is much smaller: the original 12MB become 300K...
Is it possible, and how, to preserve the original quality?

Thanks for any help.

Rodolfo