Computer colour matching with fluorescent dyes : The influence of fluorescence on reflectance - concentration relationships for fluorescent dyes, singly and in mixtures, and the effects on the prediction of recipes for use in colour matching.

摘要

A simple and feasible method of computer colour matchingudinvolving fluorescent dyes was developed. An ordinaryudabridged-spectroreflectometer with polychomatic illumination and audsimulated D65 xenon light source was employed for all measurements. Inudaddition to the normal K/S constants for non-fluorescent dyes and theudnon-fluorescent portion of the fluorescent dye'.. constants responsible forudthe fluorescent portion were necessary. Two sets of equations to relateudthe total radiance factors of dyeings with a fluorescent dye and itsudconcentration were developed respectively for self and compound shadesudwhere a non-fluorescent dye is admixed. Finding constants responsibleudfor the compound shades required a number of calibration mixtureuddyeings. Negative K/S constants were found useful when the totaludradiance factor was above that for the substrate but below one hundred.udThree computer programs? s were developed to deal withudcalibration constants for self and compound shade and also for matchudprediction. Optimization was used in all cases to minimize errors inudtotal radiance factors or colour differences. Half of the actual dyeingqudformulations from the predicted were visually passed by a panel of fiveuddyers. In this study, disperse dyes on polyester were used.udMoreover, a commercial matching package was studied usingudnon-fluorescent dyes. The dyeing system affected its accuracy. Theudpolyester/disperse dye system was better than the cotton/reactive dyeudsystem. The sample size and luminancefactor of target colours; were alsoudstudied. The accuracy was affected slightly by the latter but not theudformer.