Smart Filter in Photoshop

To apply a Smart Filter, just follow these steps:
1. Select the layer you want to apply the Smart Filter to.
2. Choose Layer > Smart Objects > Convert to Smart Object.

3. Select a filter and apply it to the Smart Object Layer. A new sublayer will
appear below the Smart Object Layer containing the Smart Filter.
4. Apply several more filters if you want. They will be stacked below the Smart
Object Layer,


Once you’ve added one or more Smart Filters to a Smart Object Layer, you can
do several things to edit, remove, or modify the Smart Filter:
■ Click the triangle icon at the right end of the Smart Object Layer to expand
or collapse display of the Smart Filter(s) that have been applied.
■ Click the Eyeball icon next to the Smart Filters top layer to turn off the effects
of all the Smart Filters in the stack.
■ Click the Eyeball icon next to individual Smart Filters to turn on or off that
filter’s effects.
■ Click the icon at the right edge of each Smart Filter’s layer to edit the filter
options for that filter.
■ Change the order in which Smart Filters are stacked in the Smart Object
Layer.
■ Paint in the Layer Mask area of the top Smart Filter layer to modify what portions
of the image are affected by the Smart Filters. (This is similar to painting
in the Layer Mask of Adjustment Layers.) However, the Layer Mask you
create applies to all Smart Filters that have been applied to a particular Smart
Object Layer; different Layer Masks can’t be applied to individual Smart
Filters in a layer.