Re: Beginner Density Questions & Digital Negs

MessageI've been drinking too much albumen-nog. 1.9 is neg density. Thanks Loris.
  ----- Original Message -----
  From: Loris Medici
  To: alt-photo-process-l@usask.ca
  Sent: Tuesday, May 16, 2006 12:33 AM
  Subject: RE: Beginner Density Questions & Digital Negs

  Michael, I don't agree with you on the fact that the cited 1.9 density range figure is referring to the reflective density of the print. In my understanding the 1.9 figure refers to the density range of the negative. And when one talks about density range this means the absolute dmax of the negative should be even higher: For instance, if the negative material's base + fog density is log 0.3, then the absolute dmax of the negative should be 0.3 + 1.9 = 2.2 - that is for being able to print a full tonal image by using the specific process (and/or coating solution/emulsion mix) which requires a negative density range of 1.9. IME, it is impossible to get a printed density range of 1.9 with palladium - this is closer to what you can get from air dryed fiber based glossy silver-gelatine paper! I can't get such a printed density range even after coating my palladium prints with glossy polyurethane wood finish... (which improves dmax by log 0.3 - 0.4 / over regular uncoated prints).

  On the other hand, with print-out palladium (ammonium iron(III) oxalate sensitizer + Li2PdCl4 - that is Ziatype w/o any contrast agent) the negative density range requirement is considerably higher than 1.9. (This is probably true for develop-out palladium also...)

  Regards,
  Loris.

  -----Original Message-----
  From: Michael Koch-Schulte [mailto:mkochsch@shaw.ca]
  Sent: 15 Mayıs 2006 Pazartesi 18:23
  To: alt-photo-process-l@sask.usask.ca
  Subject: Re: Beginner Density Questions & Digital Negs

    Gu,

    In this context the value of 1.9 is referring to the "reflective" density. In practical terms a densitometer in reflective mode would measure the darkest part of your print.
    ...

    ----- Original Message -----
      From: G Guhan Gunaratnam
      To: alt-photo-process-l@usask.ca
      Sent: Sunday, May 14, 2006 12:54 PM
      Subject: Beginner Density Questions & Digital Negs

      ...

      I’ve got some beginner density questions, largely stemming from the phrase “correct density”. I’m trying to do digital negatives for pt/pd on an R2400, MIS inks, Pictorico OHP. I’ve read Dan’s book and all the articles I can find on the net, in more than one of them a proper density range is written (ex 1.9 for Palladium). So what is this? Is this the measurment one wants in the blackest black on a negative/digi step wedge when using a densitometer? And does this correct density, then translate into the highest density “black” one can get in a pure palladium print?
      ...
Received on 05/16/06-08:39:17 AM Z