RE: Correlating Tappi Brightness
RE: Correlating Tappi Brightness
- Subject: RE: Correlating Tappi Brightness
- From: Marco Ugolini <email@hidden>
- Date: Wed, 5 Aug 2009 14:30:07 -0400 (EDT)
Roger wrote:
>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.
I would think that there must be a way that *they* determine their brightness values. I have no idea how it's done, but, if you find out how they do it, from there there may or not be a way to correlate that metric to L* or Y measurements.
Marco
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