@alnuwer If you ever come back.
There is a Gimp plugin, gmic http://www.gmic.eu which combines hundreds of filters in a single package. (this is one of the few plugins that comes with an installer)
That will give you your preview and the filter Colors -> Zone system has controls for shadows and highlights
looks like this. http://i.imgur.com/gyG8Mnv.jpg
There is a Gimp plugin, gmic http://www.gmic.eu which combines hundreds of filters in a single package. (this is one of the few plugins that comes with an installer)
That will give you your preview and the filter Colors -> Zone system has controls for shadows and highlights
looks like this. http://i.imgur.com/gyG8Mnv.jpg