QTR-Quadtone RIP

I'll probably get into trouble with this one but I think it's visual perception.. Luster paper has a micro surface that skews the reflectance... and mat papers have less reflectance then say a high gloss paper..Often times I look at a print and wish the blacks were better....  Put a piece of glass on it and it pops.. I would suggest still going for the dmax.. and not settling for a lower one as it "appears" to be the same.. Try viewing the 60% and 100% blacks under glass at the same time .. it should be visual then I would think.

jimbo
  ----- Original Message ----- 
  From: Terry 
  To: QuadtoneRIP@yahoogroups.com 
  Sent: Sunday, January 23, 2011 12:49 PM
  Subject: [QuadtoneRIP] Re: Maximum Usable Black vs. Dmax - What's the Big Deal?


    
  Does anyone have a comment on this observation I've had in working with QTR?
  Thanks.

  --- In QuadtoneRIP@yahoogroups.com, "Terry" <TerryGls@...> wrote:
  >
  > 
  > As I understand when printing out the Ink Separation Page in QTR, the Photo Black (PK) or Matte Black ink (MK) at 100% is the maximum black. Yet visually, on most Luster/Pearl/Semi-glossy papers, the 55, 60, or 65% ink square is as black looking as the 100%.
  > 
  > For example, when I measure the 100% PK ink square on Harman Crystaljet Luster RC paper, printed with Epson inks on my R800 / R1800 with my densitometer I get 2.64. The 60% black measures 2.13 yet visually looks as black as the 100%. The 60% is typically chosen to create the QTR profile yet the maximum density achievable is never really used. This general relationship is the same for all Luster/Pearl/Satin/Semi-gloss papers I've tested.
  > 
  > Yet for the inherent difference between Luster & Matte papers what is the "big deal" about high Dmax and can you really use the 100% in creating a profile?
  >



  

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