Add Layer Clipping Mask
Photoshop CS6 Tutorial
How to Add a Layer Clipping Mask in Photoshop
Clipping Masks are similar to a cookie cutter in that you have a shape on one layer that is used to define the shape of the next layer above it.
In this example we will place an image inside the boundaries of a text object.
Open an image in Photoshop (File > Open).
If the image layer is a Background layer, double-click the layer icon, then click OK to convert it to a transparency layer.
Select the Text tool (t key) and add some text to the document.
In the Layers palette, drag the Text layer below the image layer.
Option-click (PC - Alt-click) the line between the two layers. The image is trimmed to match the text layer below.
To reposition the image within the mask, select the Move tool (v key) and move the contents of the image layer.
More Ways to Clip an Image
In Step Five, we Option-clicked (PC - Alt-clicked) the line between the layers to activate the Clipping Mask. Another way to accomplish the same thing is to right-click the upper layer (just to the right of the layer name) and choose Create Clipping Mask.
You can also select the upper layer and choose Layer > Create Clipping Mask (Option/Cmd/g (PC - Alt/Crtl/g)).