[Answer] What is a contrast?

Answer: Most reliable means of detection because they use changes in established profiles

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What is a contrast? contrast - the range of optical density and tone on a photographic negative or print (or the extent to which adjacent areas on a television screen differ in brightness) Contrast definition to compare in order to show unlikeness or differences ; note the opposite natures purposes etc . of: Contrast the political rights of Romans and Greeks . See more. Definition of contrast. : to set off in contrast : compare or appraise in respect to differences Contrast European and American manners. Contrast the two major characters of the novel. b : comparison of similar objects to set off their dissimilar qualities By contrast with newer models the … Contrast is the difference in luminance or colour that makes an object (or its representation in an image or display) distinguishable. In visual perception of the real world contrast is determined by the difference in the color and brightness of the object and other objects within the same field of view. The human visual system is more sensitive to contrast than absolute luminance; we can perceive the world similarly regardless of the huge changes in illumination over the day or from plac...

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