Hi Herve,
as said, the handling of the so-called ‘negative controlpoints’ changed in CEP5. To adjust (restrict) your selection you now have the Luminance and Chrominance sliders – while in PL you also see the restriction caused by ‘negative controlpoints’ (mask view), which then can be refined further … But PL doesn’t provide those plenty colourize options like CEP.
see → Nik 5 - what is new? - #59 by Wolfgang (using layers) for to separate fore- and background effectively & effortless, for final doge & burn …
Wolfgang