In performing a mechanical task with several different colored backrounds, which colors would bring the most contrasting results in the efficency of which the task is performed?
Generally objects can be most easily perceived as separate from a background when there is maximal contrast in lightness. In other words, put light objects on a dark background and dark objects on a light background in order to best see the objects. The lightness dimension tends to be more important than the hue and chroma dimensions for the discrimination of objects (especially as they get smaller). There is another effect, known as crispening, that can become important when trying to compare two objects on a background (rather than seeing a single object). I suspect your tasks might involve discriminating difference in objects on a background. In that case, crispening is an effect whereby the apparent differences between objects appears largest when the background is of a color intermediate between the two objects. Thus, if trying to discriminate two middle gray objects, put them on a middle gray background, two dark objects, put them on a dark background, and two light objects, put
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