ERATO Proceedings Istanbul 2006.pdf - Odeon

Table 1. Theaters and odea to work on at the ERATO Project
Theaters
Odea
Aspendos (Turkey) Aphrodisias (Turkey)
Jerash South (Jordan) Aosta (Italy)
Syracuse (Italy)
Among these, Aspendos Theater and Aphrodisias Odeon have been chosen for a combined visual
and acoustical virtual reconstruction. In order to contribute to their reality, recent color records of
the Aspendos Theater and Aphrodisias Odeon were also realized. Color records of mentioned
buildings and Jerash Theater, are presented in this paper. But first of all, a wide broad definition of
color including its components, systems, ways of measurements etc. is given in order to emphasize
important role of color documentation in virtual restitution and conservation works.
2 COLOR, COLOR SYSTEMS and COLOR MEASUREMENT
2.1 Color
Definition of the color and color perception process was clarified and gained certitude with the
widening of the knowledge at the field of light and visual perception. Within the time covering
predominantly 15th -19th centuries prevailing up to modern time, it was introduced that the color is
one of the information that the light conveys to our eyes and color perception is a part of the visual
perception. The transformation of such visual information into meaningful perceptions happens
through a series of processes.
The International Commission on Illumination (CIE) defines “the color stimuli” as a visible
radiation entering the eye and producing a sensation of color, either chromatic or achromatic [3].
Just as, it was determined that human eye has the ability of distinguishing ten billion color stimulus
(Fig. 2). A color perception results from the complex interaction of many factors including the
characteristics of the object or light source, the light incident on an object, the surround, the viewing
direction, observer characteristics and the observer’s adaptation. Dependent on the features of the
mentioned factors, the character of the color perception (nature of the stimulus) is called “perceived
color” The perceived color, the color perceived as belonging to an object or light source, is
something perceived instantaneously [4].
In other words, the light comes to the eye either directly from a light source or by reflecting /
transmitting from an object and forms a color impression (perceived color) depending on the
conditions of the moment (Fig. 3). The matter is the perception process of the color properties that
the light conveys and arisen color impressions. For example, the reason of the yellow color of a pear
is that it reflects yellow light or the reason of the green color of a leaf is that it reflects green light.
On the other hand, it is obvious that when the color property of light illuminating an object changes,
perceived color of the object will also change (Fig. 4).
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