Digital BW, The Print

Paul,

Thanks for the help. I've started working on custom curves. I'm trying to establish what an ideal distribution of values should be. I note that in the Hobeman instructions for "Customizing MIS Ultratone Curves" suggest that Grayvalue percentages (21 step) vs. RGB values (0-255) be in a linear relationship. However, when I measure 21 step grayscales printed on a 2200 (with color ink) and in Piezography, I get significantly different relationship (which is closer to what I get from your curves).

The results are as follows:
Percent                 RGB
      0
     255
     
      5
     250
     
      10
     245
     
      15
     239
     
      20
     233
     
      25
     226
     
      30
     219
     
      35
     212
     
      40
     204
     
      45
     195
     
      50
     185
     
      55
     174
     
      60
     162
     
      65
     149
     
      70
     135
     
      75
     120
     
      80
     104
     
      85
     86
     
      90
     64
     
      95
     35
     
      100
     0
     


What goals are you using?

Thanks,
Bob

  ----- Original Message ----- 
  From: Paul Roark 
  To: DigitalBlackandWhiteThePrint@yahoogroups.com 
  Sent: Sunday, February 29, 2004 1:37 PM
  Subject: RE: [Digital BW] UT2 1280 Curves/Paul Roark


  Bob,

  So true.  EEM was the first one I did, and it didn't need any other points
  on the main curves, as I recall.  Subsequently I found the shadows below 75%
  often needed some points.  I should modify the Readme to reflect this.

  What I've tried to do is hold the points down in the midtones, which is
  where the tones show the most.  The idea is to make it easy for everyone to
  slightly modify the curves/tones by making offsetting moves of the red and
  green points.  In the shadows where there are points on some curves, this
  works to a certain extent also, and visual inspection of a 21-step file
  print will, I think, be easy enough to get those areas under control.

  Paul
  www.PaulRoark.com 

  For UT2 information, curves, and settings see:
  http://home1.gte.net/res09aij/
  ____________________

  -----Original Message-----
  From: rbehr2001 [mailto:rsbehr@...] 
  Sent: Sunday, February 29, 2004 9:55 AM
  To: DigitalBlackandWhiteThePrint@yahoogroups.com
  Subject: [Digital BW] UT2 1280 Curves/Paul Roark

  Paul,
  Page 6 of your http://home1.gte.net/res09aij/UT2-Readme.htm indicates 
  that the red and green curves have only 3 internal points on them. 
  But the curves I've used (Prem Semi Gloss for Eboni & Photo Black) 
  have many points on them. Am I missing something?

  Thanks, 
  Bob




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