Photoshop has a wide range of filters that you can use to add special effects to your images.
To use a filter:
1) Select the layer to apply the filter to.
2) Pull down the Filter menu. The menu consists of a list of filter types you can choose from.
3) Each menu selection (see picture to the left) represents a family of filters; each has a fly-out menu that allows you to select the specific filter you want. For example, below is the Distort fly-out, listing all of the possible distortion effects you can choose from:
Point to the desired filter family and click on the specific filter in the fly-out menu.
4) If the filter you specified needs input from you in order to fine-tune the effect, a dialog box will appear, prompting you for your preferences. When you are satisfied, click the OK button.
Credit to Dr. Mary Nicholson
