The most common type of layer is a bitmap layera layer consisting of pixels, such as a photograph or art you created with the brush tool. The most obvious way to create a bitmap layer is to click the Create a New Layer button in the Layers palette. (Figure 10.1).
Figure 10.1. Click the Create a New Layer button in the Layers palette to create a new bitmap layer.
You can also create a layer from any part of another layer. To do this: