This photo has both red and green areas of colour.
As requested the first conversion was to default black and white anfd the result is as follows :
I guess its evenly grey all over.
this next version is with the red channel lightened and the green channel darkened. I can see the effect on the red bag the subject is holding.
In the next version the adjustment is the opposite. I have darkened the red channel and lightened the green. The lady’s lips have got darker and also the bag. The green hedge is brighter too. There is a slightly different colour in each of the B & W conversions as is the coat.