you might want to provide more details as to the equipment/process you are utilizing.
i write from experience, which may not be the best...
i've scanned ~1,600 color slides using nikon ls9000 and adobe cs ps. most color correction was done at time of scan and not using adobe software. so, i'm not that familiar/skilled with adobe ps software and its capabilities.
hope this helps.
good luck!
-pmover