Split-Toning Effect
Create two new gradient maps via Layer → New Adjustment Layer →
Gradient Map. You could, for example, create a gradient from dark-blue to
beige and another from dark-brown to white. To change a gradient, click on
it to open up the “Gradient Editor” dialog box. There, click on your chosen
color patches and open up the color picker via the “Color field.”
Blending Options: This Layer