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A gray card, being neutral in color, allows the photographer to remove a potential color cast in an image. This can be achieved by creating a "custom white balance" in-camera before shooting, or the card can be included in a shot, and used as a neutral reference point in post-processing. If the card is an 18% gray card, it can be used to meter exposure.

• How do you use a gray card?
• Why are greycards used for white balance?
• How could one make a DIY Gray card for exposure/color correction?
• What's a good ad-hoc replacement for a gray card?
• How to get meter reading for a DSLR if not from a gray card?