the easiest way (no blending needed) is probably the color zones module
(see preset b/w/red for a starting point)
j.
On Tue, Oct 15, 2013 at 9:31 AM, Paolo Cavarretta <[email protected]>wrote:
> Dear all,
>
> first of all I would like to thank the darktable development team
> 'cause you are building my favorite opensource software.
> Then here is my question: I would like to apply selective color to a
> photo. e.g. I have a red flower over a green background and I would
> like to have a b/w photo with red flower.
> Here is my workflow: I choose monochrome plugin, then I choose blend
> mode "normal" and blend only if...depending on the colors on the photo
> I choose channels "a", "b" or "h" to filter out colors...
>
> With this workflow, in few minutes I have the results: the quality of
> the result depends on the photo (e.g. with a red flower over green
> background it's easy).
>
> Knowing that there a lot of way of achieving the same result I would
> like to know if there are better way for doing selective colorization
> maybe performing better with more complex and colored pictures
>
> thanks
> Paolo
>
>
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