I want to share with you a helpful online paint tool that I use quite often: Easy RGB.
Let's say you go over to a friend's house and her living room is painted the OLD Porter's Indian Ivory.
You come home and realize you only have a Sherwin Williams paint deck...Crap. How can you figure out a close match to Indian Ivory without having to go through Porter???
Go to Easy RGB (easyrgb.com) and follow these instructions:
Type in the original color name you want to match and select its brand from the drop down menu. (see below)
Then you should see the name of the paint with a bunch of weird #s below it (unless you typed it in wrong)
Click "Get Commercial Tints"
You should now see a page like this:
Don't mess with the color numbers that have appeared and ignore the HTML color # part.. just leave that blank
Last step- just select the paint brand you'd like to match your color to. Press Start.
Voila! Sherwin's closest matches to Porter's Indian Ivory.
Not close enough?
Go back and select another brand to match it to and see how close you can get.
Hope it helps!