Digital Cameras White Balance
If White Balance, how you can use a gray card?
In some digital cameras that you can adjust the white balance. If White Balance, how you can use a gray card 18% to do it? Charlie, in a digital world, business white and gray cards have very to do with the white balance. It seems to remember something about the exposure, measurement and Zone System when I was 18, about 38-odd years ago, and sold everything he had and borrowed everything he could to get the 3 days intensive workshop in Yosemite Ansel Adams that he personally once a year.
use the gray card for white balance. the gray card is a neutral color, but offers a normal reflection of a typical subject. Because of this, It allows you to adjust the white balance the camera using the same exposure settings and lighting you will use to make the picture. Using a white card can reflect as much light that can lead to the CCDs to cut the level thus may be entirely false. Remember also that this method does not work for flash photography or flash mixed and tungsten light. The term "white balance" has to do with the higher gain setting for the image of the red channel, green and blue and is an electronic adjustment. The brain compensates for what we see, and an object that we know to have a neutral reflectance (white shirt for example), we interpret was white, whatever color lighting source. Film and digital cameras are not as sophisticated, but we can help the camera, saying that a subject is neutral (ie, the gray card) and it will adjust to that.
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