Isophote definitions

isophote

line connecting points of equal light intensity from a given source
Found on http://phrontistery.info/i.html

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isophote

isophote, isophotic A line (imaginary or in a diagram) connecting points where the brightness or the illumination is the same.
Found on http://www.wordinfo.info/words/index/info/view_unit/2795/7

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