no, unless you are using layer adjustment,
try use layer adjustment instead, it is non destructive, you can revert to original state, know what have you adjusted, or alter it.
yes i did use layer.....after i click ok in curves and reopen......i am not able to see the points that i made.....is it possible to see those points that i made?
Did you make adjustments on the composite curve or on the individual color curves? If the latter, you need to go to those channels in the curves dialog to see your original adjustments.
Just to make sure we're talking about the same thing, you're using a curves adjustment layer that looks like this ... right?
I did use layer but not in the way you guys did it. I made a duplicate layer and made adjustments in the composite curves. After I clicked ok. I could not open the Curves box anymore.