(Photoshop) Create Duo Tone Images

1. Grayscale image (Image>Mode>Grayscale) because you can not use “Duotone” mode with RGB Color.

2. Select Duotone (Image>Modes>Duotone)
3. Select Duotone
4. Play with Duotone until you feel good with color tone
Wow you get it !
Moreover you can select Triotone or Quadtone to create new image color. Let try it and you will love it.