blue/red/yellow gradient map;
color dodge blending mode
blue/yellow gradient map;
opacity
browns gradient map;
linear light blending mode
gradient tool
gradient tool
technique description.
Today we learned about using Gradient Maps (found under the adjustments tab). Using the Gradient Maps, you can do a lot of fun things with color in your photos. In addition, you can work with the blending mode of the gradient map. To make the effect more subtle, you can take down the opacity.reflection.
I really like this effect because there are a lot of different things you can do with it to change your photos. I thought the colors in my first photo were really pretty.