HP INCFollow

Abstract

This disclosure relates to the field of color calibrations in a print system. Traditional

calibration obtains change factors for each of the inks of a given system and applies these

factors - per ink - to the color resources. The changes are proportionally spread for ink

combinations (in a traditional pipeline) or NPacs (in a HANS pipeline). However, there are

cases where resources may use certain ink-drop combinations (NPs) for purposes and

used by later stages of the pipeline, where calibration must apply change factors such

that these custom NP properties are maintained after calibration. One example here is

the case of technical printers where resources may use a given NP as a selector for the

backend pipeline which then decides how to re-interpret said NP depending on whether

the content being processed is a line or an area fill. Another example is to use different

NPs (for the same ink amount) for masking to use the specific NPs to apply different

masking strategies.

A calibration approach is disclosed that allows applying calibration factors by NP and

doing so in a way where the structure of an NPac, made up of different NP properties, is

preserved after calibration. This approach results in a much greater level of control, the

preservation of custom properties in HANS Lookup Tables (LUTs), as well as the ability

to selectively calibrate – e.g., calibrating area fills but not lines for a given segment of

color space. Furthermore, if different choices are made in different parts of color space,

these too are maintained after calibration.

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Creative Commons License
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