As well as being a developer, I am an artist. I make most of my artwork with GIMP and I save my artwork into a folder in jpg format. I now make sure that a transparent layer was not accidentally added at some point and then the image not flattened before saving it, however, in the past I was not aware of the signs that my image was being saved with a transparent background so that is a little bit of a nuisance to me that out of my over 300 pieces of artwork in that folder, maybe somewhere from 50-100 of them have transparent background which I do not want to be present.
So I was wondering if there is a way to automatically remove the transparency from all the jpgs in said folder without losing any quality or causing other issues?
I am running Ubuntu GNOME 17.04 with GNOME 3.24.