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Textile Surface Structure Importance and Kubelka - Munk Theory in Use in Colour Match Calculations

One of the parameter of greatest interest in the production of coloured surfaces is their colour constancy and one of the most serious practical problems attend the change in colour appearance with change in conditions regarding the surface characteristics. The colour appearance of textile surfaces is usually modeled through Kubelka– Munk theory. The Kubelka– Munk colour model describes the reflectance of coloured sample as a function of absorption spectrum K(λ )  , a scattering spectrum S(λ )  and the reflectance spectrum of the substrate. When there is a variation in measurement of samples dyed with different shaded dyestuff in corresponding concentrations, certain differences will occur in K/S values and the reliability of K-M operations will become a question. In this paper the aim was to point out the shortcomings of Kubelka – Munk theory and to analyze the influence and the importance of surface structure of sample and also the size of measured surface through the performance of K– M colour match calculation on yellow and blue dyed samples. Due to this aim certain calculation of predicted colour values were performed using numerical software tool MATLAB. Using MATLAB, simulation of coloured samples based on K/S values were made and than compared to the results of the real measured dyed samples, also the correction of concentration were performed. The results were also analyzed statistically.

Kubelka-Munk; optical data of dyes; surface structure influence; colour calculation; Matlab

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