Digital BW, The Print

I had a "grid pattern" appear in a print on my R2400 today, and was at first worried
about the printer but soon realized it was just noise in my blue channel. Not 
sure exactly where it came from, but it's there in the file. Has anyone else noticed this 
grid-like posterization in darker areas of the print? (this print happened to be color, but if I'd 
used the blue channel in a B/W results would have been similar).  The original file was a 
Canon D20 Raw capture, imported through ACR as a 16 bit file and then adjusted minimally 
in Photoshop (can't see any real gapping in the levels histograms, though the bottom part of 
the blue channel is a little bit stair-step looking). The image was dark to start with so this 
may just be telling me to make better exposures -- that I'm pushing the limits of exposure 
latitude -- but I'm curious to know if anyone else has seen this particular phenomoenon or 
knows more about it. 

Linda

Yes, but way back in ACR v1.0, I would be surprised to see it now; wish I
could remember what file it was.  Try setting noise reduction to zero, and
working space to prophoto for this image as a test.  Sorry, I can’t recall
the details of it; just too long ago.

Best regards,
John Moody

-----Original Message-----
From: DigitalBlackandWhiteThePrint@yahoogroups.com
[mailto:DigitalBlackandWhiteThePrint@yahoogroups.com]On Behalf Of Linda J.
Thorsen
Sent: Thursday, September 08, 2005 4:56 PM
To: DigitalBlackandWhiteThePrint@yahoogroups.com
Subject: [Digital BW] Grids in the file...

I had a "grid pattern" appear in a print on my R2400 today, and was at first
worried
about the printer but soon realized it was just noise in my blue channel.
Not
sure exactly where it came from, but it's there in the file. Has anyone else
noticed this
grid-like posterization in darker areas of the print? (this print happened
to be color, but if I'd
used the blue channel in a B/W results would have been similar).  The
original file was a
Canon D20 Raw capture, imported through ACR as a 16 bit file and then
adjusted minimally
in Photoshop (can't see any real gapping in the levels histograms, though
the bottom part of
the blue channel is a little bit stair-step looking). The image was dark to
start with so this
may just be telling me to make better exposures -- that I'm pushing the
limits of exposure
latitude -- but I'm curious to know if anyone else has seen this particular
phenomoenon or
knows more about it.

Linda






[Non-text portions of this message have been removed]

I cobbled together a rushed profile for UT7+FS-Y to evaluate the bronzing
with the new MIS base.  I have Eboni installed, so I made a No-Black
profile; the Dmax is ~2.35.

I am pleased to report that the bronzing is very low.  Way better than my
trials with 2200-UC.
Gosh, I worked for many hours with 2200-UC/QTR on Kirkland, and sprays, and
gave up on it.

There is gloss differential as you would expect, but it’s about the same as
my 4800 test print on Epson premium glossy in the highlights and a little
worse than that in the shadows.

There are pizza wheel tracks, and a quick look inside the printer does not
suggest an easy fix, but I’m not that motivated at this point.

Best regards,
John Moody




[Non-text portions of this message have been removed]