[1] http://www.dpreview.com/forums/thread/2284675#forum-post-27416922
First, get it as close as you can using custom white balance.
1. Get a white card or a piece of white poster board.
2. Prop it up where your subject will sit.
1. Get a white card or a piece of white poster board.
2. Prop it up where your subject will sit.
3. Take an out-of-focus picture of it (be sure to fill the frame with the white card).
4. In your 40D's menu, find the "Custom White Balance" setting.
5. Select the picture you just took.
4. In your 40D's menu, find the "Custom White Balance" setting.
5. Select the picture you just took.
Now your white balance setting will be very close to reality, if not actually spot-on. Next, shoot RAW quality. In your RAW conversion software of choice (probably DPP, which came with your camera), use the eye-dropper to set your white balance. The white of your subject's eye is usually an excellent WB reference point. Teeth are usually yellowish, making them a very bad reference point.
