The Digital Grey Kard Premium White Balance Card Set with Premium Lanyard (Set of Three Cards) from Digital Image Flow brings science to the art of digital color control. Digital Grey Kard is the user-friendly, economical, and indispensable color correction tool that belongs in every photographer's bag. Digital Grey Kard gives you perfect digital color every time.
By using this set of three cards - Black, White and Neutral Grey simply take a picture of the card in the same lighting your subject is (or was) in. Use auto white balance and P (Program) mode for the picture. You can either use the resulting picture as the basis for a custom white balance setting, or you can use the White Balance Card Set picture during post processing for a custom white balance.