Keep 1 colour in a BW picture

Question

Hello, I am on LightRoom Classic v.13.1 on MacBook Pro M2 and I wish to transform a photo in BW but keeping 1 colour on a particular detail, for example a picture with different people in which someone has a flower in his hands and I wish to keep the colour on the flower only while oll the rest has to be black&white.

Could you mplease help me? I sow some videos but all related to all LR releases and thus I can repeate those commands on v. 13.1. - Thank you

GoldingD · Accepted Answer

Another way

In my example, I have a photo of a Rose, or Roses.
Accomplish your normal basic edits.
Create a Mask, perhaps subject, perhaps Object, including your desire detail in the mask
Name this mask Rose
Select the mask, then select to Duplicate and Invert the mask
Rename this mask Not Rose
With the Mask, Not Rose selected, adjust the saturation to 0 (this is not the only way)
Add/Sub to either mask as needed
Edit the Rose mask as needed (sliders)

Rob_Cullen · Answer

One quick way is-1) Develop the colour image- leaving it in colour mode.2) Open the Colour Mixer Panel and reduce all Saturation sliders to  -100- EXCEPT for the colour you want to remain.3) Create a Develop Preset to apply the action on other images..If some areas have unwanted remaining colour- Tidy up with a Brush mask to desaturate brushed areas.You will need to export a derivative JPG or TIF, PSD, PNG to embed the changes. (RAW data cannot be changed)

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