Patent Document ID: 20030147088
Application ID: 09196689
Patent Status: 0

Claim One:
1. A method for deriving a reverse model look-up table whose entries represent device dependent colors as a function of device independent colors, based on a forward model look-up table whose entries represent device independent colors obtained in response to printout of corresponding device dependent color components, wherein the forward model and the reverse model look-up tables both comprise a grid of cells in their respective color spaces with entries at each grid point of the grid, the method comprising the following steps to determine an entry in the reverse model look-up table for a device independent target color: performing a binary search of the forward model look-up table to locate a cell that contains the device independent target color; interpolating entries from the forward model look-up table at grid points that define the cell so as to obtain device dependent colors corresponding to the device independent target color; and storing the device dependent color at the grid point of the reverse model look-up table for the device independent target color.