Color reference targets. (A) FlexiPalette Color Match (Smile Line SA, St-Imier, Switzerland), a standard reflector of 18% gray. This gray reference card can be sterilized in an autoclave at 135°C, making it suitable for clinical applications. (B) WhiBal G7 Card Pocket (Michael Tapes Design, Grove City, USA), a gray reference target with defined CIE Lab* values (L* = 75, a* = 0, b* = 0) designed to better accommodate digital sensor characteristics. ColorChecker Classic Mini (Calibrite, Grand Rapids, USA) contains 24 color patches (18 natural colors and 6 grayscale patches), serving as a comprehensive color reference target designed for accurate color calibration through precise color reproduction with exposure and white balance control.
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