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Volume: 6 | Article ID: art00041
Colour Printer Characterization by Regression with Greyspace Constraint
  DOI :  10.2352/CIC.1998.6.1.art00041  Published OnlineJanuary 1998

The White-Point Preserving Least Squares (WPPLS) algorithm is a method for colour correction that constrains the white point to be exactly mapped into its correct XYZ equivalent. For printers, however, the mapping is from device coordinates to colorimetric densities: the devicewhite is thus mapped into a zero vector and the WPPLS method cannot go forward. Here we use a polynomial regression model and specify that both white (the zero vector) and an average grey be exactly mapped. Moreover we extend the method to accurately but approximately map a subspace of the entire achromatic curve, thus reproducing the neutral tones with far greater accuracy.

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Mark S. Drew, Graham D. Finlayson, M. Ronnier Luoy, Ján Morovič, "Colour Printer Characterization by Regression with Greyspace Constraintin Proc. IS&T 6th Color and Imaging Conf.,  1998,  pp 193 - 196,

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