| 摘要 |
The invention relates to an image dependent gamut mapping method for mapping source colors of an image to destination colors reproducible by a printing apparatus, said source colors and destination colors being part of a color space comprising a lightness axis, each source color having a lightness component within a range between a source white point and a source black point on the lightness axis, and each destination colors having a lightness component within a range between a destination white point and a destination black point on the lightness axis. The method determines a composed transfer function which maps the source white point onto the destination white point and the source black point onto the destination black point, applying the composed transfer function on each lightness component of source colors of at least a part of the image. The transfer function is composed of linear mappings. The steepness of each linear mapping is determined by a mathematical optimization problem, which is intended to preserve lightness and contrast in the image produced by the printing apparatus under the conditions of at least one constraint. The invention also relates to a printing apparatus for processing a digital image adapted to perform a method as described above. The invention also relates to a program stored in a computer-readable medium for processing a digital image according to the method described above. |
