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Correcting for the colour of the light a photo was taken in, using a known white object as a reference. Without it, the same teeth read warmer in a bathroom and cooler by a window — the single largest source of error in a phone-based shade scan.
How a white reference card fixes itOne photo gives you a whiteness score, a VITA shade match and a visible stain estimate — the vocabulary in this glossary, applied to your teeth.