Can you desaturate a layer and target a specific hue to stand out?

@JimmyPage11 TO madd a bit more to @Stephen Marsh 's tips -  Do your desaturation in an adjustment layer, rather than direct on the image - then use a mask on thatadjustment layer to keep the adjustment off the hero figure. 

I hope this helps
neil barstow, colourmanagement net - adobe forum volunteer - co-author: 'getting colour right'
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You either need to use a selection or mask, so that the hero has colour while the rest of the images doesn't.