Digital BW, The Print

Bob,

The Lab readings depend on the paper, curve and ink batch.  The "b" axis is
variable.  On the "a" axis I target a "neutral" tone (which I have generally
defined at cyan = yellow in CMY density measures) that has positive Lab "a"
that is less than 1.0).  A typical PhotoRag "neutral" curve midtone from my
7600 UT7 setup is (58, 0.23, 1.23).  For EEM a typical UT7 midtone would be
(76, 0.52, -1.05)  I'm using IJC for the 7600, so I don't have 21-step
prints for it.  (IJC use 26 steps).  

(These are from my 7600 IJC curves that are not that are not exactly
"neutral" at this point.  In fact, I seem to be moving to a slightly
warm-neutral for matte prints on rag paper.  For un-brightened paper like
UltraSmooth-PremierArt and Permajet Alpha-Innova Soft Texture (I think),
which I prefer, the curves are getting even a bit warmer.)

The general shape of the curves are essentially the Lab relative density
distribution for both IJC and my RGB curves.  My old curves use a visual
density 50% of 0.61, which is about L = 56.  In IJC there is a slider that
varies the gamma to whatever you want.

As I've been saying for some time, I may move closer to a L 50 for the 50%
midtone.  As I'm working up the digital images, that workflow may determine
this.  I keep those files in Adobe RGB as I work them up.  So, I'll probably
end up making curves that more closely match my Spyder2Pro-calibrated
monitor. 

Paul
www.PaulRoark.com 


> -----Original Message-----
> From: DigitalBlackandWhiteThePrint@yahoogroups.com
> [mailto:DigitalBlackandWhiteThePrint@yahoogroups.com] On Behalf Of Bob
> Frost
> Sent: Wednesday, June 29, 2005 6:33 AM
> To: DigitalBlackandWhiteThePrint@yahoogroups.com
> Subject: Re: [Digital BW] Advanced B&W was Re: 4800 v. UT7 1600 dpi scans
> 
> Paul & Steve,
> 
> What sort of lab readings does one get using UT7 to print a 21point
> neutral
> grayscale?
> 
> Bob Frost.
> 
> ----- Original Message -----
> 
> 
> Steve,
> 
> For comparison, here is a 21 point set of readings (i1 and MeasureTool)
> from
> the R2400 using Advanced B&W with the default settings of Neutral/Darker.
> 
> 
> 
> 1      94.21    -0.20    -3.60
> 2      89.45    -0.02    -3.20
> 3      84.62    -0.01    -2.88
> 4      80.46    -0.03    -2.68
> 5      75.57    -0.07    -2.89
> 6      70.99    -0.35    -2.68
> 7      66.51    -0.10    -2.14
> 8      61.72    -0.30    -2.01
> 9      57.06    -0.53    -1.93
> 10    52.32    -0.44    -1.95
> 11    48.09    -0.49    -1.63
> 12    43.16    -0.58    -1.62
> 13    37.83    -0.36    -1.14
> 14    32.26    -0.40    -0.94
> 15    27.61    -0.41    -0.65
> 16    22.82    -0.27    -0.43
> 17    17.83    -0.18    -0.39
> 18    13.03     0.03    -0.35
> 19      8.57     0.21    -0.03
> 20      5.52     0.04     0.18
> 21      2.93    -0.07    -0.33
> 
> The cool shift is due to the paper (Premium Glossy) showing through the
> ink.
> 
> 
> 
> 
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