Inverting Dust and Scratches Mask

[rfinch]

I'm trying to draw a small mask in a scan so this part will not be affected by the Dust and Scratch Removal. When I make my mask, the small section is the ONLY part of the image where dust was removed. I need the inverse of this.

The manual says that you can make an inverted selection by holding the Alt key when making a mask. But this doesn't seem to work. How can get this to work?

[LSI_Ketelhohn]

Dear user,

You can inverse a selection by clicking and holding the mask button for a moment.
You will get a menu where you can edit and invert the mask.

Screen Shot 2016-10-07 at 17.18.34.png (20.14 KiB) Viewed 1117 times

Kind regards,
Arne