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A New Colour–matching Computer
Author(s) -
CUTLER A. E.
Publication year - 1965
Publication title -
journal of the society of dyers and colourists
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.297
H-Index - 49
eISSN - 1478-4408
pISSN - 0037-9859
DOI - 10.1111/j.1478-4408.1965.tb02636.x
Subject(s) - basis (linear algebra) , computer science , reflection (computer programming) , reflectivity , matching (statistics) , function (biology) , transfer function , recipe , optics , artificial intelligence , algorithm , computer graphics (images) , computer vision , mathematics , statistics , chemistry , physics , engineering , geometry , electrical engineering , food science , evolutionary biology , biology , programming language
A theoretical analysis, based on a modern theory of diffuse reflection, has led to the derivation of a modified form of the Kubelka–Munk equation for textiles which considerably increases the accuracy of dye–recipe prediction, particularly for full depths. A further improved function for use with plastics materials has also been derived. These functions have been embodied in a colour–computing system comprising an abridged spectrophotometer, a data–transfer system, and a computer, designed to give results accurate to 0–2% and rapid, largely automatic operation, and which may be used by relatively unskilled staff. Details are given of the various parts of the computer and of its use for standardising dyes, calculating predictions on a spectral basis, and making corrections on the basis of either spectral reflectances or tristimulus values. Features of the equipment include entirely automatic reflectance measurement, data–transfer and conversion to K/S units, display of reflectance or tristimulus errors at all stages, an improved method of correction, and automatic indication of the cost of predicted recipes.