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1. (WO2015044064) PROCESS FOR PREPARING A COLOUR CHART

Pub. No.:    WO/2015/044064    International Application No.:    PCT/EP2014/070075
Publication Date: Fri Apr 03 01:59:59 CEST 2015 International Filing Date: Tue Sep 23 01:59:59 CEST 2014
IPC: G01J 3/46
G01J 3/52
Applicants: AKZO NOBEL COATINGS INTERNATIONAL B.V.
Inventors: PANJA, Debabrata
Title: PROCESS FOR PREPARING A COLOUR CHART
Abstract:
The invention relates to a process for arranging a plurality of colours or coloured objects in a defined sequence so that each colour or coloured object has at least one neighbouring colour or coloured object, comprising the steps of a) assigning all colours or coloured objects a position in an at least two-dimensional colour space, b) assigning all neighbouring colours or coloured objects a colour difference value corresponding to the length of a vector connecting the neighbouring colours in the colour space, c) assigning a direction to every vector in the colour space connecting two neighbouring colours or coloured objects, d) arranging the sequence of colours or coloured objects in such a way that the overall sum of i. all colour difference values over the sequence and ii. all direction difference values of two consecutive vectors is minimized, and wherein a weight factor x is assigned to the sum of all colour difference values and a weight factor y is assigned to the sum of all direction difference values of two consecutive vectors prior to minimization of the overall sum, and wherein at least one of x and y is not zero.