Apply filter, i.e., noise to a particular area

[rancidfrog]

Having the ability to apply filters to a specific area would be great.
I tried with Noise, but you can only paint it on, which is not precise.
Using area to apply filters, like noise and blur would be good

[uli-on]

I think it'd be sufficient if the mask could be painted while zoomed into the image. That'd be soo cool!