Proceedings PaperMatching up to CIE--a comparison of methods in light of constraints
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With electronic-imaging input and output devices describing colors in their own native quantized triplets and color management systems translating between them through conversion models to a reference color space, calibration to the reference should be optimized in some sense within the constraints of the model. When a model allows for three channel-specific functions in addition to a linear channel-mixing transformation, the optimization of functions and transformation separately can be improved upon by their simultaneous optimization. As an example, the calibration of scanner RGB values to CIE XYZ values employing both separate and simultaneous optimization will be demonstrated and compared using color difference measures. An iterative technique to perform simultaneous optimization when a closed-form solution cannot be found will be presented. The reason for an improvement in calibration accuracy using simultaneous optimization is just that the responses of input and output devices are functions of their own particular color space, which is being inferred in the process, rather than that of the reference.