I often look at tutorials for commercial software to get ideas about post processing.
One thing I’ve seen lately is gradient mapping in photoshop. You design a gradient, then the computer maps the gradient tones depending on the luminosity of the pixel.
The GIMP also offers gradient mapping, but as far as I can tell, you set up the gradient ahead of time, do the gradeint mapping, and then it is applied.
Photoshop gives a realtime update (like “Preview” in most other GIMP effects) that lets you tweak the colors of the gradient. As you change the sliders on the gradient, the image changes immediately.
Is there some sort of workaround to do this in gimp?