The auto-exposure corrects that.

I go with 18% gray, works awesome especially in different types of artificial light such as shooting video at night under halogen lights, where you would normally have trouble getting perfect white balance. I shoot a lot of indoor skate parks and the lighting varies all over the place, I would be lost without my 18% gray, makes life simple, also I notice my shots have much sharper focus when I have the correct white balance.

I just had to get some paint for 18% gray, makes it easy to paint objects such as a dolly or a piece of wood to have the correct white balance readily available.

I took my Kodak gray card to Lowe's and had them scan the color and make me a quart of paint, I have seen 18% paint online at outrageous prices, $100 up. This as a lot more durable and cheaper than Kodak Gray cards which can cost up to $65 a set.

Here is the formula - if I recall it was around $8 to $10 a quart

Valspar Ultra Premium
Interior Eggshell finish
Base 4 - Quart size
101-32 107-3.5 109-3.5 113-2Y10

I am pretty sure if you get a gallon it changes the formula, so be sure to tell them the formula is for Quart size, they can convert it to a gallon, if you need more.

Sorry for bringing up an old topic (old wounds)
I figured some people would want the formula
but I'm a newbie, so what do i know

Thanks for the formula, Ralph.

As an aside: it amazes me how many people I work with think that 'white balancing' refers to setting the exposure. I'm about to start referring to the process as 'colour balancing' instead.

Interesting to see a discussion from 2002 pop up! Now that videos can placed into a post, I hope that some find this example of the warmcards to be useful.

White Balance your camera Warmer with Warmcards on Vimeo