Sometimes, when postprocessing images in GIMP, I:
- Duplicate the image to layer 2.
- Gaussian blur layer 2 with a radius enough to remove fine detail.
- Invert layer 2.
- Desaturate layer 2.
- Put layer 2 above the original image on "soft light."
The effect is that the image looks somewhat HDR-ish. An auto white-balance, perhaps saturation, and you're set.
I've noticed that this technique is useful when there are a low of shadows or highlights that can be rescued. What are the applications of my procedure?