GAMUT aim and GAMUT mapping method for spatially varying color lookup tables

A non-transitory computer-readable medium storing a program for causing a processor to execute a process for image spatial uniformity correction in an imaging system, the process comprising:

• determining an achievable gamut, wherein the achievable gamut is a gamut achievable by the imaging system for at least one of:
• all spatial locations of an output image, all print engines of a plurality of print engines, and at least one printer within a cluster of printers;
• determining a mean gamut, wherein the mean gamut is any gamut containing the achievable gamut;
• performing a gamut mapping from the mean gamut to the achievable gamut;
• determining a set of transformations for each of a set of input colors to a set of target colors, the set of target colors selected from colors in the achievable gamut;
• for a received digital image, transforming values of at least one of each received image pixel and clusters of received image pixels to transformed values based on the determined set of transformations;
• and
• generating an output image based on the transformed values.

An image processing apparatus, comprising:

• at least one imaging engine for generating output images;
• and
• a processor for controlling operation of the image processing apparatus, the processor comprising:
• an intersection-calculating unit configured to determine an achievable gamut, wherein the achievable gamut is a gamut achievable by the at least one imaging engine for at least one of:
• all spatial locations of an output image, all print engines of a plurality of print engines, and at least one printer within a cluster of printers;
• a mean ERS- and gamut-determining unit configured to determine a mean gamut, wherein the mean gamut is any gamut containing the achievable gamut;
• a gamut-mapping unit configured to perform a gamut mapping from the mean gamut to the achievable gamut;
• and
• a transform-determining unit configured to determine a set of transformations for each of a set of input colors to a set of target colors, the set of target colors selected from colors in the achievable gamut;
• wherein the image processing apparatus is configured to:
• transform values for a received digital image of at least one of each received image pixel and clusters of received image pixels to transformed values based on the determined set of transformations;
• and
• generate an output image based on the transformed values.