Explore the relationship between radiation and appearance.


Characterize the appearance of and measure the intensity of the surface radiation of white, gray, and black targets both under room light and sun light. (Be sure to make note of angle of the illuminant source and the viewing angle. Are there specular components?) What do your results tell you about the relationship between radiation and appearance?


light meter, black, gray, white, and color surfaces

Questions to Consider


We theorized that we could predict that relative perceived value could be calculated as follows:

value = (surface reflection / ambient light),

and that contrast could be calculated as follows:

contrast = (light - dark) / (ambient light).

Part 1: Using Java, create a 400x400-pixel applet. You can only use black and white (no Java gray). Create a graphical object that appears gray. The interface should be simple, click once and the object should appear light, click again and the object should appear dark. You can do this through any means except changing the color of the object itself. Try to be creative. The conditions you implement could involve size, texture, motion, etc... It is more important to experiment than to present a foolproof solution.

Part 2: Given that these theories are true, what would you speculate about noise sensitivity as a function of lighting conditions?

Part 3: A television with the power off appears to be a greenish-gray color . Explaination how you perceive black on television when the set is turned on?

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Last Modified: November 08, 1997