The project file for this tutorial can be downloaded here.
Step 1: In the Workspace Inspector create two or more layers. Select the top layer to inspect it and modify its composition controls.
Tip: To open the composition controls for the layer in its own window click the expand button.
Step 2: Adjust the composition mode and opacity settings to control how the layer is rendered over the layer below it.
Tip: The OpenGL blend modes are faster than CoreImage and Quartz Composer composition modes. Use them when possible.