Rachel, That's a terrific idea.
I use the computer when I need help with the color value. In fact, that's what I was doing this morning. I take a picture of the fabric I want to use and download it. Next open it up and convert it to a black and white photo. It's amazing! What I thought was light really reads more medium and one that was medium had to move way over to the light side.
What would our great, great grandmother's think?