Method of creating and using a four color device gamut descripto

Details Method of creating and using a four color device gamut descripto Method of creating and using a four color device gamut descripto

1996-04-18

1998-02-24

Herndon, Heather R.

Computer graphics processing and selective visual display system

Computer graphics processing

Graph generating

G06T 1500

Patent

active

057215723

ABSTRACT:
A device gamut boundary surface in a device independent color space (DICS) is defined by a set of small triangles. Each triangle in the DICS corresponds to a triangle on the surface of a 3D or 4D color cube in a device dependent color space (DDCS). The triangles in the DICS are derived based on a look-up table which can be obtained by measuring a set of color patches produced from the given device. A small set of carefully selected gamut boundary points in the DICS are determined, and their corresponding points or signals on the surface of the color cube in the DDCS are computed. These data are stored in a table called a gamut descriptor. Points in a gamut descriptor can be determined by a convex polyhedral cone inclusion process, and their corresponding points in the DDCS can be determined by triangle interpolation. The gamut descriptor usually includes gamut boundary points at a number of lightness layers along a series of predetermined hue angles. Gamut descriptor is a compact representation of gamut boundary. The point distribution pattern in a gamut descriptor provides useful information for determining in-gamut and out-of-gamut points, and for fast mapping between color spaces in cross-media color calibration.

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