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Title: Parametric effect of observer variability in cross-media colour reproduction
Author: Kitsara, Chrysiida
ISNI:       0000 0004 5994 9464
Awarding Body: University of Leeds
Current Institution: University of Leeds
Date of Award: 2015
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The development of new imaging technologies has made the understanding of differences between observers even more demanding. The factors that influence the outcomes of cross-media colour-matching experiments were investigated in this study. In total.six cross media colour matching experiments were implemented, between physical samples and LCD monitors. The first experiment. implemented the use of a 46" LCD TV display and two sets of physical samples to perform colour matching tasks. The outcomes of this experiment are presented and discussed in two parts, each corresponding to the nature of the physical sample set. The first part, Part A, involved colour matching of the ColorChecker Chart. The second part, Part B, involved 5 garments. The garments were chosen to reflect dominant hues of the CIELAB colour space axes including red, green, yellow, blue and an achromatic grey. On both experimental parts the observers used a custom designed software interface to match the colour of the presented physical stimulus against its real size digital reproduction on the display screen. The results showed a similar magnitude of the inter-observer variations between the two experimental parts and better intra-observer performance in Part 2. The second experiment involved colour matching of solid colour printed surfaces on a desktop 20" LCD display. The printed samples were shown to two separate age groups of 10 observers under 4 different viewing angle conditions. The measured colour-matches from the LCD screen provided a dataset to estimate the inter-observer magnitude and the influence of age and viewing size factors. The dataset was used to test the newly proposed colorimetry methods using individual colour matchinq functions. On one hand the CIE2006 colorimetry framework was implemented and on the other Sarkar's Observer categories were used. The outcomes indicated the change in stimulus size as well the age of observers should be taken into consideration in colour-matching experiments. The use of the newly developed method for implementing individual colour matching functions indicated a better performance in fitting observer variability than that of the CIE Standard Observer.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available