Digital BW, The Print

Scott

I "only" have a 6x loupe and I guess it is impossible to tell (I am looking
at a BO step wedge on ISP now) whether it is 3K or 1K.  It is certainly a
lot grainier in the highlights than an Adv B&W step wedge and warmer in tone
in steps 35-80.  Steps 5-30 appear quite neutral.  Maybe you are correct.
(To be clear, there are three options in the driver: colour, Adv B&W and
black.)

If that is the case, then the maybe the gain Clayton sees in the 4800 print
is simply due to a greater and smoother ink coverage rather than less.  That
would be odd because this has been available for some time, eg the MIS FSN
inks.

For those who can read the numbers, here are the results of a Quickread of a
21-step wedge on ISP (sorry I am not going to change inks just to post the
results for matte paper).  You can see how the colour gets very warm in the
middle and very cool as they paper comes through in the highlights.

  
 L       a       b       V
 95.66  -0.36    -5.31   0.05
 87.35  -0.25    -4.48   0.15
 82.25  -0.39    -3.32   0.22
 77.53   -0.5     -2.27   0.28
 73.21  -0.62    -1.38   0.34
 68.93  -0.77    -0.46   0.41
 65.03  -0.89    0.41    0.47
 61.11  -0.99    1.41    0.53
 56.34  -1.15    2.65    0.62
 52.59  -1.21    3.77    0.68
 48.23  -1.17    5.26    0.77
 44.28  -0.94    6.71    0.85
 39.89  -0.5     8.09    0.95
 35.94  -0.07    8.85    1.04
 31.86  0.28     9.14    1.14
 26.18  0.45     8.67    1.31
 21.16  0.28     7.77    1.47
 15.91  0.05     6.89    1.67
 10.15  0.25     5.18    1.93
 4.64   0.02      1.04    2.29
 2.79   -0.18     -0.61   2.52


Steve

> From: scott_now_coming <scott_now_coming@...>
> Reply-To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
> Date: Tue, 28 Jun 2005 15:15:31 -0000
> To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
> Subject: [Digital BW] Re: 4800 v. UT7 1600 dpi scans
> 
> <I was hoping the 2400
> had a BO mode because the 4800 BO print shows much promise. But it
> apparently has no BO mode.>
> 
> Does the 4800 have a BO mode using only ONE black ink?
> 
> Or, are you refering to the Advanced B&W mode that uses all 3 black
> inks?
> 
> (Couldn't find anything on the Epson site stating the 4800 has a BO
> mode using only one black ink: http://www.epson.com/cgi-
> bin/Store/Landing/UltraChromeK3.jsp?BV_UseBVCookie=yes )
> 
> Thanks Clayton,
> 
> Scott