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# About layers

A Layer represents a part of a picture as pixels. Layers are stacked on top of each other, and the final appearance of the picture depends on their order.

A Layer contains just one picture, which can be superimposed on another one. The superimposed picture can cover the same area as the pictures combined together or it can cover just a part of the original picture. In some cases, a superimposed picture can cover a bigger part than the final picture.

Two Layers can be blended by using one of several modes. Blending results in various combinations of different light and colors. Learn more...

Layer Mask

A Layer Mask is linked to a layer and hides a part of it in the final picture. Learn more...

Create layer

- You can create a layer from already existing images or from your iSight. Learn more...
- You can also duplicate an existing layer by following that procedures:
  - Choose Layer ‣ Duplicate Layer
  - Press Command ⌘ + J
- To create a new layer:
  - Choose Layer ‣ New Layer...
  - Press Shift ⇧ +Command ⌘ + N