[Efficient way to recolour objects within a photo]

Hi

Hoping someone on the forum can assist with this question.

I am in need of an efficient method of changing an object within a photo to a standard colour without losing the shading and highlights. I am aware of the lasso selection tool but I have to do this process on potentially thousands of photos so need (in my perfect world) either an automated process or ( in a less perfect world) a process that takes only seconds per photo.

Anyone aware of a program. utility, plugin or anything else that can accomplish this?

All meaningful input gratefully accepted.

Thanks in advance.