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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.
Man, Tak-ming
Man, Tak-ming
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Publication Date
2009-09-01T15:20:23Z
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The University of Bradford theses are licenced under a Creative Commons Licence.
Peer-Reviewed
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Accepted for publication
Institution
University of Bradford
Department
Postgraduate School of Studies in Colour Chemistry and Colour Technology.
Awarded
1984
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man.pdf
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Abstract
A simple and feasible method of computer colour matching
involving fluorescent dyes was developed. An ordinary
abridged-spectroreflectometer with polychomatic illumination and a
simulated D65 xenon light source was employed for all measurements. In
addition to the normal K/S constants for non-fluorescent dyes and the
non-fluorescent portion of the fluorescent dye'.. constants responsible for
the fluorescent portion were necessary. Two sets of equations to relate
the total radiance factors of dyeings with a fluorescent dye and its
concentration were developed respectively for self and compound shades
where a non-fluorescent dye is admixed. Finding constants responsible
for the compound shades required a number of calibration mixture
dyeings. Negative K/S constants were found useful when the total
radiance factor was above that for the substrate but below one hundred.
Three computer programs? s were developed to deal with
calibration constants for self and compound shade and also for match
prediction. Optimization was used in all cases to minimize errors in
total radiance factors or colour differences. Half of the actual dyeingq
formulations from the predicted were visually passed by a panel of five
dyers. In this study, disperse dyes on polyester were used.
Moreover, a commercial matching package was studied using
non-fluorescent dyes. The dyeing system affected its accuracy. The
polyester/disperse dye system was better than the cotton/reactive dye
system. The sample size and luminancefactor of target colours; were also
studied. The accuracy was affected slightly by the latter but not the
former.
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Type
Thesis
Qualification name
PhD