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Anonymous
assuming you're not trollin, the camera adjusts the rgb values so that certain colors are neutral (white, gray, black) and setting the white balance to a white card will make it so white things will look white, even if the light is colored differently. for example, shooting under incandescent light will make everything look red, and adjusting your white balance compensates by enhancing the blue and green channels. is it necessary? of course not, but if you are in bad light it will make the colors a lot better.
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