[EMAIL PROTECTED] mused: > > For setting white balance, you should use a pure white card, > not a neutral gray card. > Paul
In theory it should make no difference - your camera can't tell the difference between a white card under dim lighting and a grey card under bright lighting. In practice there usually *is* a difference, although usually ony of interest to gear heads. I've seen some colo(u)rimetric results that suggest white cards are just a little more prone to discolouration, so a gray card is a slightly better choice. (The difference, though, is hardly noticeable - under 1%). Far more important is to make sure that your test object fills a significant amount of your total field of view.
