I corresponded to Blender 2.8 2019.01.18 version.
Add-on that manipulates the mask.
We added an existing Blender 2.79 add-on "Mask Tools" to Blender 2.8, and added a function.
Save Mask To Vertex Group
Vertex Group To Mask
Mask Smooth
ver0,36,0 Update
Classify the menu. The execution button is enlarged
Added function to thicken / reduce mask
To make it possible to set the repeat of Smooth · Fat · Less function
Added ability to sharpen mask
Download zip - Github
https://github.com/bookyakuno/-Blende...