Choose Delete Hidden Layers from the Layers menu or the Layers palette menu. Merging layers
When you have finalized the content of layers, you can merge them to create partial versions of your composite image. The intersection of all transparent areas in the merged layers remains transparent. Merging layers helps manage the size of image files.
Note: You cannot use an adjustment layer or fill layer as the target layer for a merge. (See "Merging adjustment layers or fill layers"on page 314.)
In addition to merging layers, you can stamp layers. Stamping allows you to merge the contents of more than one layer into a target layer while leaving the other layers intact. Typically, the selected layer will stamp down to the layer below it.
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Adobe Photoshop can be a complex tool only because you can do so much with it, however for in this video series, we're going to keep it as simple as possible. In fact, in this video you'll see an overview of the few tools and Adobe Photoshop features we will use. When you see this video, you'll see how you can do so much with so few features, but you'll learn how to use them in depth in the future videos.