Scene-dependent variables

Scene-dependent variables are shown in Table 2.2. They consist of the design tools, that is, scene materials and lighting, and the design itself 

Materials and lighting are design tools. There are three types of physically definable material properties - optical properties, physical form, and temporal properties. Optical properties include tight distribution occurring over the surface and within the depth of the material as well as reflectance, transmission, 

Design involves the creation of a whole from materials building blocks and lighting. It has two functions, to make the product or scene communicate, indicate or symbolise, and to make the product or scene look good. Colour can be a primaiy part of an object, for example, the red of the traffic light. Colour can also be a secondary property, such as that incorporated in a barely noticed room decoration. However, for most foods the colour is a primary property, it tells us about the eating quality. 

As a primaiy property food colour identifies, it advertises that a frait is ripe and directs us to harvest, or it informs us the roast meat is ready to eat, it arouses our expectations and anticipation, and motivates us to eat. If the meat is green, the colour commands us not to eat. Colour of frait and vegetables is a symbol that reinforces our belief that we are eating a healthy meal that will perhaps initiate a cure for our current condition. We eat a piece of traditional white and bine wedding cake so that it will bring good luck to the happy couple. 

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The total appearance of a scene comprises the visual images within us. These images are controlled by viewer-dependent variables and scene-dependent variables. Viewer-dependent variables consist of the viewer s individual visual characteristics, upbringing and preferences, and irrunediate environment. Scene-dependent variables consist of the physics of the constituent materials and their temporal properties combined with the way these are put together, and the scene illumination providing light and shade to define the voltrme and textrrre of the scene. The model considers the build up of appearance images. 

Table 2.2 Total Appearance - scene-dependent variables (Hutchings 1999)...

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