If you donot have Graphics processing unit(Grphics card) or if you have one that doesnot support the Photoshop, then Repousse in Menu item will be greyed out.Hence ensure that you have a suitable card. You can go to preferences-performance and verify whether openGL drawing is checked.In case of non compatible cards this will be greyed out and u need have uptodate drivers or a replacement of card---Bosu Babu
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