02-07-2022, 08:45 AM
Once you add your layer mask you have to paint in it.
White layer mask, paint in black
Black layer mask paint in white.
There is information on use here: https://thegimptutorials.com/how-to-mask/ and here: https://www.gimp.org/tutorials/Layer_Masks/
and a quick animation demo using a black layer mask: https://i.imgur.com/Z6rogIP.mp4
Another question, what purpose ? I hope you are not trying to emulate a clipping path in a PS jpeg. Not going to work.
White layer mask, paint in black
Black layer mask paint in white.
There is information on use here: https://thegimptutorials.com/how-to-mask/ and here: https://www.gimp.org/tutorials/Layer_Masks/
and a quick animation demo using a black layer mask: https://i.imgur.com/Z6rogIP.mp4
Another question, what purpose ? I hope you are not trying to emulate a clipping path in a PS jpeg. Not going to work.