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This question already has an answer here:

I have taken some pictures over the weekend and think they will look good if the image was in black and white but the main subject was left in colour. I have Photoshop. Can anyone tell me how to do this?

marked as duplicate by MikeW Apr 9 '17 at 21:00

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

  • Selective color is for if you want to keep only certain specific colors. This question sounds more like the OP wants specific items/areas to be left in full color regardless of hue and the rest of the photo converted to monochrome/gray scale. I've usually heard that referred to mores as "spot color." – Michael C Apr 10 '17 at 4:35
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Just mask the area you want to keep in color, and desaturate the rest.

https://www.google.com/search?q=Masking+tutorial+photoshop

https://www.google.com/search?q=desaturating+in+photoshop

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