| US 7,508,557 B2 | ||
| System and method for processing a multi-colour image | ||
| Carolus E. P. Gerrits, Velden (Netherlands) | ||
| Assigned to OCE Technologies B.V., Venlo (Netherlands) | ||
| Filed on Mar. 02, 2005, as Appl. No. 11/69,569. | ||
| Claims priority of application No. 04075679 (EP), filed on Mar. 03, 2004. | ||
| Prior Publication US 2005/0195420 A1, Sep. 08, 2005 | ||
| Int. Cl. G06K 1/00 (2006.01); G06F 15/00 (2006.01) | ||
| U.S. Cl. 358—518 [358/1.9] | 21 Claims |
| 1. An image processing system for processing a digital multi-colour image for reproduction thereof on a colour image reproduction
system provided with at least five process colours defining a gamut, the image processing system comprising:
a colour processing module configured to divide the gamut into a plurality of sub-gamuts such that each sub-gamut is defined
by a set of only three chromatic process colours of the at least five process colours, and to select for each pixel of the
digital multi-colour image a corresponding sub-gamut from the plurality of sub-gamuts;
an analysis module configured to judge, for each pixel of the digital multi-colour image, whether or not to add an additional
process colour of the at least five process colours to the set of only three chromatic process colours; and
a generation module configured to generate image signals from the digital multi-colour image, each image signal being associated
with a digital separation image of a process colour of the plurality of process colours and specifying an image density value
for the associated process colour for each pixel of the digital multi-colour image, the image density value for the associated
process colour for the pixel being zero if the associated process colour is not part of the set of only three chromatic process
colours defining the corresponding sub-gamut.
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