recently updated!
This Filter only works on the Alpha Channel of the Layer you're working on.


BackGround


Make a New Layer (the Type Tool in PhotoShop automatically makes a New Layer for you)


After Typing on the Layer

Uncheck 'Preserve Transparency'

like this


Very Versitile - Highlight/Shadow can be at any Angle (by 15 degree incraments)
here I blured the layer slightly to kill the hard edges


Example 2


Make a New Layer


Any Grafix you choose


Original Color is Preserved at any Opacity you choose, HighLight/Shadow Opacity is Separately Controlled