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As Kevin has said, we have almost no idea what you are asking, but at a guess, if you use the Color Sampler tool and place some points over areas you want to edit, those values will change in real time as you make adjustments with something like a Curves adjaustment layer.  It's a handy trick.

@Avinash31398683l3tl can you give more context and details, screenshots, examples of what you are asking?