Digital BW, The Print

I thought the point of this thread was that because matte paper had a more
diffuse reflection than "photo" paper that a measurement (stress:
measurement) of the dMax of that paper was fundamentally biased because of
the typical measurement device used (0/45 geometry).  The corollary to this
is that in a diffuse light setting the two prints would "look" the same
black.  (I don't believe they do and believe that photo black on "photo"
paper is fundamentally blacker.)  Using a sphere instrument one can make a
measurement for which the lighting is diffuse.  We could then know how much
of the dMax difference is attributable to the underlying absorption of light
and how much is due to the difference in surface properties.


> From: John Moody <moodymz3@...>
> Reply-To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
> Date: Wed, 1 Jun 2005 23:12:33 -0400
> To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
> Subject: RE: [Digital BW] Matte versus glossy Dmax: a matter of physics?
> 
> Steve,
> What measurement with what type of light source are you looking for?  It
> would seem that a total reflectance measurement ignores the observer, so I'm
> not sure what the value of such a measurement would be?
> 
> John