Sometimes you'll need to apply color correction while an image is in flux.  Maybe you have compositional elements that aren't tacked down, or you're still refining your character designs.  There are a million scenarios where you might want to apply a set of color corrections to a group of objects. Better yet, you might want to continue moving and modifying those objects.  

Can we have the best of both world?  Yes.  Layer groups and clipping masks are the solution.

AuthorMatt Kohr