Function: The gray side is used for exposure compensation and the white side for setting the white balance. Professional level: By placing a gray card in the scene to be photographed at a defined angle to the direction of the incident light and reading it with a reflected light meter, the photographer can be sure that the exposure is even. For photography: An essential part of the digital photography process for a photographer or hobbyist. Application: Gray cards can be used for incamera white balance or postprocessing white balance. Specify a standard reference object for determining exposure in photography. Key benefits Accurate exposure: Uses a gray reference to ensure even exposure across shots. Accurate white balance: The white side supports correct white balance incamera or during postprocessing. Flexible workflow: Suitable for both incamera adjustments and postprocessing workflows. Use scenarios Instudio portraits: Place the gray card in the scene to meter exposure with a reflected light meter, then adjust lighting for even results; use the white side to set white balance. Outdoor scenes: Include the gray card in the foreground to quickly establish exposure and white balance before shooting. Product photography: Use the gray card to standardize exposure and color across multiple shots and lighting setups for consistent postprocessing.