RE: Correlating Tappi Brightness
RE: Correlating Tappi Brightness
- Subject: RE: Correlating Tappi Brightness
- From: Roger <email@hidden>
- Date: Wed, 05 Aug 2009 08:58:36 -0400
Mike,
I've always wondered the same thing, wouldn't it be convenient to go from
Lab to Tappi brightness and vice-versa. But, I was told that, on top of
measuring reflectance at 452nm, Tappi uses an illuminant C type of light
source, unlike the tungsten light source used in an EyeOnePro, for instance.
Personally, I never tried to relate the two measurements mathematically, in
Excel, for instance. I live with 72 Brightness corresponding to L89 for
SWOP5 and 88 Brightness corresponding to L92 SWOP3. I know, far from
perfect.
Best / Roger
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