layermask
nounUK /ˈleɪəmɑːsk/
US /ˈleɪərmæsk/
A tool that hides part of a picture so you can work on just one layer at a time.
She used a layermask to paint the sky without touching the trees.
OTHER MEANINGS
2. A setting in software that controls which parts of a layer are visible or hidden.
The layermask made the logo fade smoothly into the background.
3. A technique in photo editing for blending two images together.
He applied a layermask to blend the portrait with the sunset.
4. A digital filter that protects certain areas from changes.
The layermask kept the edges sharp while the middle was blurred.