Define "exact". Are you trying to match it to a color on your screen? Or something physical?
Generally speaking, I tend to select the object I want to change the color of then use masked Hue / Saturation and/or Curves layers to effect the change.
Can you show an image?
For me it is hard to understand you. English is second language for me.
Yes I am trying to match it to a color on my screen. Can you help? If you did not understand I can explain in the another way. Thank you beforehand.
As I suggested above: Add a Hue/Saturation layer, then manipulate the controls so that the color changes to what you need. Note that the Hue/Saturation feature has the capability of isolating its operation to just color ranges.
I also suggest using the Translate link the web forum provides at the lower-right of each message to help you in understanding.
thanks alot it works.