RE: Correlating Tappi Brightness
RE: Correlating Tappi Brightness
- Subject: RE: Correlating Tappi Brightness
- From: Roger <email@hidden>
- Date: Wed, 05 Aug 2009 14:56:17 -0400
Marco,
That's the thing. Tappi "brightness" is a simple measure of reflectance at 452nm. *But* the measuring apparatus is very peculiar in its design. I think the light source, the way it illuminates the sample, is not coming at plain 45 degrees, if memory serves. And a few other idiosyncrasies like that. Which makes relating this measurement to CIELab 0/45 daunting.
Roger
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