Digital BW, The Print

Martin,

I use a stack of white paper under the target just on the assumption that a
print will be mounted on an off-white mat board.  Consistency is probably
the most important thing.

Paul
___________________________
  -----Original Message-----
  From: Martin Wesley [mailto:mwesley250@...]
  Sent: Friday, October 18, 2002 11:00 PM
  To: DigitalBlackandWhiteThePrint@yahoogroups.com
  Subject: [Digital BW] Reflective Densitometer Method


  I am fooling around with a used X-Rite 811 transmission/refection
densitometry I picked up on eBay and I have a couple of questions for any
experts on sensitometry lurking out there.



  In reading reflective density of inkjet prints there is the issue that the
paper is not completely opaque. You can see light though even the heaviest
papers we are using. So when measuring image density the print being
measured needs to be backed up with an opaque material. My question is
should this be white, as in stacking up several pieces of paper under the
print or should it be black? My inclination is to use black so that no light
that passes through the paper gets bounced back, since this would logically
seem to falsely increase the reflectance and lower the density reading. The
calibration plaques are enameled metal so I assume the instrument expects to
see a 100% opaque reflective target.



  Dumb question: How do you convert RGB densities to CMY densities or do
they simply equal their color opposites?



  The 811 has two transmission modes, one for E-6 and one for C-41. Which
would be the best for standard developed B&W film? Which mode would be best
for yellow/green stained pyro developed B&W film?


  Martin Wesley

  http://www.borderless-photos.de/guests.html




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