füüsikaline suurus, mis on ette nähtud seostamiseks tajutava paistvuskontrastiga ja mida harilikult määratletakse ühega mitme valemi hulgast, mis sisaldavad vaadeldavate valgusstiimulite heledust
quantity intended to correlate with the perceived brightness contrast, usually defined by one of a number of formulae that involve the luminances of the stimuli considered
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