Can I change only part of image to grayscale

Hi,
Got an image with a colour bottle in the foreground and some shading in the background which is a gray colouring, but obviously still made up of cmyk.
Once I isolate the bottle from the background, how do I suck the colour our of the background to leave it printing just black?
Thanks

PECourtejoie wrote:
P Taz, I thought that the user did not want any rich grey? And if the K layer is darkened on the grey areas?
C'est vrai, Pierre....
But that is precisely what would be wrong with the result, no process trap.  The OP's reasoning was that it is hard to keep it neutral, but I say no, that is not a good enough reason for me.
Here are samples, first the 'grey method' and second the rich grey.  Rough example but with the rich grey you have bigger tonal range available and process trap as well.  I deliberately used a slightly blurry photo because it illustrates the point albeit slightly exaggerated...  If you could see the cyan plate on example one, there would be no cyan in the background and therefore possible fit problem to (ex) green areas, resulting in a 'cut-out' look that used to be common with litho film seps.
Example two, the edge has process trap and the cyan plate fills the areas between the blue shirt and the green leaves for example because they cannot be misregistered as they are on the one plate. I have mixed a little tone into the neutral areas to make more of the density range...
EXACTLY the same mask used for both.

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