The Digital Gray
Card is simple, easy-to-use, ultra portable and economic white balance
tool. A white balance tool consists of one or series of spectrally
neutral objects used for digital color balancing. With the Digital Image
Flow Digital Black/White/Gray Color Balance Cards Set for digital
photography you'll get correct color balance, in any shooting situation,
every time. If you want more accurate color reproduction than the auto
white balance setting on your camera can provide, then this tool is a
must have.