MacAdam ellipses

Aug 13th, 2016
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Harvard University
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colour theory

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Out of the WoodBY M I K E WO O DMacAdam ellipsesDue to the increasing use of solid state lighting devices, utilizing MacAdam ellipsesto define the color point specification of lamps is becoming more prevalentIVE TALKED ABOUT MACADAM ELLIPSES in these articlesmore than once, and given brief descriptions about what they areand their relevance to our industry. However its still a topic thatsnot as well or widely understood as it should be, so I believe itbears a longer exposition. MacAdam ellipses have long been usedto define the color point specification of lamps, and that use isbecoming even more prevalent as we move to using solid statelighting devices where the necessary evil of binning becomes anessential concept.MacAdam ellipses provide a guideline as to how accuratethe average persons color vision is, and how good they are atdistinguishing between similar colors. MacAdam ellipses, like justabout all photometric topics, are not absolute measurements basedon some definable physical property such as weight, length or time;instead, they are derived from statistical measurements of the visionproperties of samples of the population. There are no abs

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