During my experiments with a leaf material it occurred to me that that the mix material is the fundamental way to create complex materials. I ended up rendering various materials in a test scene and then importing them into GIMP layers so that I could adjust the components more interactively than re-rendering the entire scene. Ie, the transmission/ reflection components of glossy/ translucent materials. The problem is that GIMP doesn't have the dynamic range to adjust these accurately. Adjusting image materials isn't possible directly but you can adjust the colours globally. I guess I have two questions:
1) Does anyone else do it this way
2) Might be a useful standalone program - would anyone use it?