LUT for Color Calibration

Color distortions introduced by the image acquisition chain can be corrected by comparing sample colors from the image with their true values. A calibrated color chart, such as the IT8, is required.

  • Sample colors are the average color in a suitable ROI using PixelAverage.
  • True color values are specified in the XYZ color system. Even though the reference colors are described by their XYZ coordinates, the image to be calibrated must contain RGB information.

The calibration transform can be based on one, three or four reference colors. In the first case, calibration is a gain adjustment for the three color components. In the second and third case, a linear or affine transform is used.