A NOOB question when using this tool how can I erase some part where I don’t want the parametric mask instead of drawing addition mask?
For example I am drawing a parametric mask which covers the sky and also some other areas which I don’t want, how I can erase that part with a brush?
Apply the brush where you want to erase, then click on the button (’+/-’) next to the drawn mask drop-down. That will reverse the polarity of the drawn mask, and so include everything except the mask you have drawn.
For “simple” in/exclusions you should follow @elstoc’s advice.
You can achieve just about anything you like, however complicated, by using the mask manager module in darkroom view. The part you are specifically looking for are the Set operators
Harry Durgin covered the mask manager in this video. Skip to about 36 minutes into the video.
thank you all for your advise.