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Conventional models (e.g., a Gain‐Offset‐Gamma model) were developed based on the assumption of channel independence. Modern displays (e.g., organic light‐emitting‐diode OLED displays), however, sometimes have crosstalk effects among the three channels, making these conventional models have poor performance. In this article, we propose a 3D piecewise model. It divides the display gamma encoded RGB...