I did something similar recently with a photo of a bright orange fish in muddy water. To desaturate the water while leaving the fish as-is, I used the "color correction" module with a parametric mask that excluded the fish's hue (using the "input" slider on the "h" tab in the parametric mask settings).
-- August Schwerdfeger aug...@schwerdfeger.name On Mon, Jan 16, 2017 at 9:30 AM, Anton Aylward <li...@antonaylward.com> wrote: > My Sony camera has a "picture" setting that produces an image that brings > out > one primary color and makes the rest of the scene B&W. You've probably > seen > this kind of effect in advertising. > > The downside of using this in-camera option is that it (a) only works for > the 3 > primary colours and (b) only works in JPG mode, not RAW. > > I prefer to use RAW and post-process since I can also do things like deal > with > skylines and shadows, so I wonder how I would do this in DT after I've > done that > basic processing. > > If this is a single discrete object such as a red sport scar in the midst > of > otherwise banal traffic, such a I've seen in adverts, then its easy enough > to > crop. But there are many situations where the colour you want is > distributed, > perhaps the green of trees on a street scene. > > As I say, this only works for primary colours. I can think of a few > photographs > I've got where I'd like to apply this technique but the color I want to > bring > out isn't primary. > > Other then simply killing the green and blue in a color profile, what can > I do > about the sport car scene? or red and blue in the trees in the street > scene? > > > -- > Rule of Feline Frustration: > When your cat has fallen asleep on your lap and looks utterly > content and adorable, you will suddenly have to go to the bathroom. > ____________________________________________________________ > ________________ > darktable user mailing list > to unsubscribe send a mail to darktable-user+unsubscribe@lis > ts.darktable.org > > ____________________________________________________________________________ darktable user mailing list to unsubscribe send a mail to darktable-user+unsubscr...@lists.darktable.org
