[Brush the selection into a mask]

12 hours ago, Marco1990 said:

 

Thank you for you're reply. I've already tried this and this works fine. But I worked with photoshop before and my work flow was to brush it with the brush tool so I was a little confused and didn't know that the selection works like this.

[Brush the selection into a mask]

Hello all together, 

I want to work with luminosity masks. I already created them, but now I want to brush into my mask only the selected area. But my problem is, that the brush tool doesn't stop at the borders of my selected area, it always fills the whole mask (not only the selection). I hope you can understand my problem and maybe help me by solving this. In the attachement is an example. I only want to brush the selection.

Thanks a lot!