Sepia In Photoshop

Introduction:
Sepia was originally a toner in the darkroom which made the image turn brown. This also happens to an old aged photograph. In these times this affect is sought out by people to create a vintage image like i wish to get with mine.   This is the processed involved in this:

First you must add a filter to the image you can select this tool from the quick tool box on the right hand side.

  Then on the drop down menu select the sepia option and then select your decided opacity.

  You would normally want this a 100% as it is not very visible and it is still faint, but this is part of the affect to the image as you want it to look like an aged photo.