Color conversion method for compact printer system

G - Physics – 06 – T

Patent

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G06T 9/00 (2006.01) B41J 2/01 (2006.01) B41J 2/525 (2006.01) B41J 3/36 (2006.01) B41J 3/44 (2006.01) B41J 13/12 (2006.01)

Patent

CA 2390678

A color conversion method and apparatus for a compact printer system. An image processor converts a stored image from a first tri-color space to a second tri-color space. Resultant transformation values are read from lookup tables for each color component of the stored image pixels and a single cycle interpolator unit performs linear interpolation to generate a single color component in the second tri-color space in 14 cycles. In one example, the L*a*b* color space is converted to CMY color space. In another example, the RGB form is converted to the L*a*b* form and two extra L* components for use in sharpening a converted image.

L'invention concerne un procédé et un appareil de conversion des couleurs, destinés à un système d'impression compact. Un processeur d'images convertit une image mémorisée d'un premier espace tricolore en un second espace tricolore. Les valeurs de conversion en résultant sont lues à partir de tables de recherche pour chaque composante de couleur des pixels de l'image mémorisée. Une unité d'interpolation à cycle unique effectue une interpolation linéaire de façon à générer une composante de couleur unique dans le second espace tricolore en 14 cycles. Dans un exemple, l'espace de couleur Lab est converti en espace de couleur CMJ. Dans un autre exemple, la forme RVB est convertie en forme Lab et deux composantes L supplémentaires à utiliser pour affiner l'image convertie.

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