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post-corrections, checking stage
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da5nsy committed Dec 11, 2019
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8 changes: 5 additions & 3 deletions Conclusions.tex
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Expand Up @@ -6,10 +6,10 @@ \section{Summary of Conclusions}
\begin{enumerate}
\item Assuming the applicability of general damage functions, potential damage may be reduced by using light sources with lower \glspl{CCT} (Figure \ref{fig:CCTvsDI}).
\item Museum professionals currently do not employ this technique, in part due to conflicting results as to how \gls{CCT} interacts with observer preference (Section \ref{sec:CCTmus}).
\item One potential cause for these conflicting results (involvement of melanopsin in colour constancy) was examined with results showing no evidence for a strong or simple interaction (Chapters \ref{chap:LargeSphere} and \ref{chap:SmallSphere}).
\item To address limitations in the performed experiments, and assist with designing future experiments, a computational study was performed to explore whether a melanopsin interaction would be beneficial for colour constancy (Chapter \ref{chap:Melcomp}).
\item One potential cause for the conflicting results of experiments looking to find a canonical preferred \gls{CCT} might be if \glspl{ipRGC} were involved in colour constancy or chromatic adaptation. This possibility was explored with two psychophysical experiments. The results showed no evidence for a strong or simple interaction (Chapters \ref{chap:LargeSphere} and \ref{chap:SmallSphere}).
\item To address limitations in the performed experiments, and assist with designing future experiments, a computational study was performed to explore whether a melanopsin interaction would be beneficial for colour constancy (Chapter \ref{chap:Melcomp}). It was found that there was value in a melanopic input to chromatic adaptation or colour constancy. It was also found that the spectral sensitivity of melanopsin is close to optimal for providing this type of signal.
\item In response to this, and observations from psychophysical work, future work is proposed (Section \ref{sec:fut}).
\item A novel method for performing colour constancy experiments with a tablet computer has been provided, and recommendations for further development are suggested (Chapter \ref{chap:Tablet}).
\item A novel method for performing colour constancy experiments with a tablet computer has been provided, and recommendations for further development are suggested (Chapter \ref{chap:Tablet}). This method seems valuable since it allows for colour constancy experiments to be performed in natural environments. It was found that overall this methodology is effective, with certain caveats and controls required.
\end{enumerate}

\section{Contributions to Museum Lighting}
Expand All @@ -28,6 +28,8 @@ \section{Contributions to Vision Science}

However, since based on the results of \citet{kraft_mechanisms_1999} it seems likely that colour constancy is achieved through the interplay of a great many factors, and there is not a single panacea to the problem of illuminant variance, special care should be taken. It is likely that in some situations certain mechanisms or cues are given weight, where in another situation, others are prioritised.

Since at this time there is no clear indication of the level at which the visual system might use a melanopic signal, it seems wise to focus future experiments on high-level and naturalistic behavioural tasks such as colour naming and differentiation of surface from illumination changes, rather than techniques which potentially primarily probe low level mechanisms, such as achromatic matching.

\section{Future work} \label{sec:fut}

Future work relevant to the computational study and the tablet method is listed at the end of the respective chapters. A number of recommendations for future sphere-type psychophysical investigations are provided below.
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6 changes: 5 additions & 1 deletion Interviews.tex
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Expand Up @@ -83,4 +83,8 @@ \subsection{Colour Rendering}
\section{Conclusion}
Generally, the interviewees believed that visitor requirements were being met (although there is often difficulty in defining exactly what visitor requirements actually are) and no specific tool or technology was proposed that would provide a clear benefit. Several interviewees mentioned that a way to improve the accessibility of colour rendering indices (in terms of the ease with which they could be understood and applied) would be appreciated. No interviewees knew of recent surveys similar to the present one.

The impact that these interviews had on the research which followed is such; it became clear that \gls{CCT} was a tool which could be used to reduce damage, but which was not being used at the time. One of the barriers to use was a lack of understanding of how \gls{CCT} interacted with other visual appearance properties and preference. It therefore seemed valuable to attempt to extend our understanding of chromatic adaptation and colour constancy, with the hope that this would allow museum professionals to limit damage through specification of lower values of \gls{CCT}.
\section{Interim Summary}

The impact that these interviews had on the research which followed is such; it became clear that \gls{CCT} was a tool which could be used to reduce damage, but which was not being used at the time. One of the barriers to use was a lack of understanding of how \gls{CCT} interacted with other visual appearance properties and preference. It therefore seemed valuable to attempt to extend our understanding of chromatic adaptation and colour constancy, with the hope that this would allow museum professionals to limit damage through specification of lower values of \gls{CCT}.

The following chapters all seek to extend our knowledge of colour constancy and chromatic adaptation.
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