by Julieanne Kost
To apply a nondestructive filter to a layer, convert the layer into a Smart Object before adding the filter (Layer > Smart Object > Convert to Smart Object). A Smart Filter mask will automatically be added, enabling you to selectively hide and show the filter. To edit the filter settings, double-click on the name of the filter. To change the opacity and/or blend mode of the filter, double-click on the small icon to the right of the filter name.