Paint Colors: In Photos vs 'Real Life'

I've gotten lots of emails asking for paint colors used in various rooms/ specific projects.  And I've been so terrible about answering them.  (I'm sorry!!)  My first excuse is that when I don't remember them off of the top of my head, I put off going down to where our paint is stored or opening a client's file and finding the name of color.  It ends up being one of those things that just gets