The Curves tool affects light’s two primary influences: tones and contrast. Tonal curves are also what give different film types their unique character. It can intensify an image and make it more detailed.
Open up your picture in Photoshop.
Go to Layer >> New Adjustment Layer >> Curves. We’re going to be changing the Red Channel first. My settings:
Click Ok after you have all your settings to what you want.
Now to make sure your Layer Palette is out, click F7 and duplicate the Curves layer by right clicking on it and selecting Duplicate Layer.
Set that layer to Overlay 25%.