Apr 27 2009
Adobe Photoshop– How to lock the transparency of a layer.
Locking the transparency of a layer will prevent changes being made to the
level of opacity and restrict editing to just the content of opaque and semi-opaque
Open the Layers palette from the Window menu. Select the layer whose transparent
pixels you wish to lock and then click the Transparency button beside the word
"Lock". This can also be toggled on and off by hitting the "/"
key while a layer is selected.