Between grayscale and color is split toning. Add this slight change for a dramatic effect. This Photoshop technique can also be used to create retro or abstract results.

Preview of Final Results

Step 1: Run Photoshop and open a photo

Start Photoshop and open any photo. This photo effect will work with most versions of Photoshop.

Step 2: Add a Hue/Saturation adjustment layer

Choose Layer > New Adjustment Layer > Hue/Saturation. When the Hue/Saturation window appears, click OK without changing any settings. You should now have a new Hue/Saturation layer in your layers palette.

Step 3: Duplicate the layer and rename

Make sure that you have the Hue/Saturation adjustment layer selected in the layers palette. Press Ctrl+J or go to Layer > Duplicate Layer. You should now have two adjustment layers. Rename the top layer to Highlights and the middle layer to Shadows. To rename a layer, double-click on the layer name in the layers palette.