Adding Detail to a Light Image
Photoshop CS6 Tutorial
How to Add Detail to a Light Faded Image in Photoshop
Older scanned Images can sometimes fade over time. This technique will darken the image and bring back the detail.
Open a faded image in Photoshop (File > Open).
With your image on the Background layer, duplicate the layer by dragging the Background layer to the Create New Layer icon or Cmd/j (PC-Ctrl/j).
Set the upper layer Mode to Multiply.
If the effect is too strong, adjust the upper layer Opacity.
If the effect is not strong enough, duplicate the upper layer and repeat the process.