You can apply any filter also only to a specific area of a layer in the document by using the selection tools where the desired area gets selected before applying the filter.

Step by step guide

• 1. Selected the desired content in the document with any of the selection tools

• 2. Choose a filter either from the Image or Filter menu

Note: Before choosing a filter please ensure that the right layer is selected where the filter should be applied to.
• 3. After applying the filter only the selected content is modified by the filter