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Additional info for An introduction to mensuration and practical geometry
White surfaces reflect most of the illuminance. ) The brightness of a stimulus, then, is the actual experience of visual intensity, an intensity that often determines its visibility. From this discussion, we can see how the visibility or brightness of a given stimulus may be the same if it is a dark (poorly reflective) sign that is well illuminated or a white (highly reflective) sign that is poorly illuminated. In addition to brightness, the ability to see an object—its visibility—is also affected by the contrast between the stimulus and its surround, but that is another story that we shall describe in a few pages.
This is light with no dominant hue and therefore not represented on the spectrum). When wavelengths are not diluted by gray, like pure red, they are said to be saturated. Diluted wavelengths, like pink, are of course unsaturated. Hence, a given light stimulus can be characterized by its hue (spectral values), saturation, and brightness. The actual hue of a light is typically specified by the combination of the three primary colors—red, green, and blue—necessary to match it (Helander, 1987). This specification follows a procedure developed by the Commission Internationel de L’Elairage and hence is called the CIE color system.
The features state what the system will be able to do and under what conditions. Examples for the camera design might include items such as tripod mount, flash and fill-in flash for distances up to 15 feet, zoom lens, automatic focus and shutter timing capability, at least 16 MB of memory and LCD display. The performance requirements and system features provide a design space in which the design team develops various solutions. Finally, in addition to the objectives and system features, the specifications document lists various design constraints, such as weight, speed, cost, abilities of users, and so forth.