My friend Deb Platt mentioned one could do "split-toning" to enhance the pictures or to give them some cool vintage look. Original idea is to use one color to tone highlights and another color for shadows. After searching I discovered one can use gradients for that. On the picture you see how to do this, but here are the stages explained:
- Duplicate layer and keep it selected.
- Change the mode of that layer for 'Soft light' and change opacity for 50%.
- Open the gradients dialog under layers.
- Choose gradient you like to try.
- Then from menu select 'Colors > Map > Gradient map'.
If you are not satisfied, then undo and select another gradient. Or make a gradient of your own. On some pictures gradient like 'Blinds' help to make picture more graphical. Or try something like 'Franch flag smooth' to give a vintage tone.
- Split toning in GIMP at gimp-tutorials
- Split tone script at GIMP Plugin Registry
- How to Split Tone With Gradient Map in GIMP at Graphics Software