Does gimp have optical filter imitations?

[godek]

I noticed that gmic has plugins for krita too. I know you can edit 16bit in that program but can it be a raw file also? Maybe krita is the better options guys?? I prefer to use gimp afterwards though.

I am using manjaro lxde linux fully rolling release distribution of linux.

What is banding?

edit: What else can cause banding with editing images in the gimp?