I have a few questions about white balancing using a card. Specifically, shooting a scene with a white card in frame, and then using something like Vegas' white balance plugin to white balance the scene by clicking on the card.
It looks like the card matters a lot. If you buy a generic white balance card on Amazon, you've apparently already lost -- at least according to Leeming's reviews:
https://www.leeminglutpro.com/whitebalance.html
So let's assume we've got a good accurate white card. I assume we want to white balance for the light falling on the scene, with as little reflected light falling on the card as possible. Ie, if shooting outdoors in daylight, you want the sun and the blue light from the atmosphere/sky on the card, but not, for example, the green light reflecting off the lawn you're standing on.
So it seems like maybe there is a bit of art to doing this well?
Am I getting the gist of this right? Any tips or pointers toward good resources much appreciated.