Laymask is used mainly for composite pictures.
When you have to compose a picture, you can take another picture and erase it. But why is it difficult to wear a mean layer mask? You may wonder
The reason is that when you do a calibration, you can erase or restore it for natural synthesis, because you can use a layer mask to do an infinite number of iterations while the original is still alive.

1. Combination of Forest Squirrels in Gapyeong, Gyeonggi-do
2. Seoul Jungnangcheon Building and Flower Photography
3. Combination of Flower Photographs of Changgyeong Palace and Jeonju Gyunggijeon in Seoul