Operationalize = put into some operation or how do you mesure it. Sorry for the bad jargon :( Do you compare the white point spectral reflectance to decide on the presence of fluorescence? And, how does one evaluate it? Or quantify its effect? Or nature? Or intensity? Or size? It's one thing to state the concept but it's quite another to "operationalize" it, some times. >> How do you operationalize that? > > Sorry, my dictionary doesn't define "operationalize" :-) > > Could you ask you question in some other terms ? > > Graeme Gill. Roger Breton | Laval, Canada | graxx@xxxxxxxxxxxx http://pages.infinit.net/graxx