Script-Fu -> Color Temp
This is an adjustable script which adjusts the images color temperature. Certainly more refined than simply dragging around a color slider, due to adjustable settings:
- Obtain original temperature from: slider below or foreground color
- Original temperature (K)
- Target temperature (K)
- Intensity (here meaning brightness)
- Saturation change
The script can be a bit awkward to start working with, since you don't see a preview as you move the sliders around. But I find it worth the effort if I do a little tweaking.