Digital BW, The Print

Clayton

Go for it my friend. Wow it is great when you see this
kind of enthusiasm, not just for oneself, but for the
BO community at large.

We all owe you a great debt

Woody Spedden

--- Clayton Jones <cj@...> wrote:


---------------------------------
Hello Ernst,

>What are the best results with QTR and BO for the
different  Dither 
>Algorithms ?  The effect must be more visible in BO
printing and may 
>vary per printer and paper. I also wonder what looks
most alike the 
>Epson driver in BO mode. Just curious.

I've been wondering that myself (haven't used QTR much
yet, been
working only with the "Ordered" setting which is
slightly
tighter/smoother than Epson) so your question made me
go find out.  On
a 2200 w/ Eboni and my current QTR BO curve (still
under development)
I printed a step wedge on EEM for each dither setting
and compared
them.  All were with 2880 and "Faster" speed setting
(more about that
below).  Here are the results:

-----------------------------------------------
Ordered - smaller patterns of dots than Epson's
squigglies, slightly
tighter pattern, slightly smoother in appearance.

Adaptive Hybrid - tiny difference in pattern if you
look hard for it
with the loupe, but for eyeball appearance is nearly
indistinguishable
from Ordered.

Fast - Pretty much same as Adaptive Hybrid, but under
the loupe I see
a tiny bit of dither banding.

Very Fast - Horrible!  Prints streaks of graphic
patterns.

Hybrid Floyd-Steinberg - Surprise!  Very tight and
smooth.  Noticeably
smoother to the eye compared to Ordered and Epson.

EvenTone - More surprise.  Ever so slightly smoother
than Hybrid FS.
-----------------------------------------------

For a more practical test to verify the above, I
printed a landscape
with clouds, an image that has always showed up BO
weakest area,
smooth midtones.  It verified all of the above ramp
observations. 
There is a place in the clouds with little swirling
patterns that are
barely defined in Epson BO, are a tiny bit better with
Ordered, and
are very crisp and clearly defined with HFS and
EvenTone, with
EvenTone being a tiny bit the better of those.

I am delighted.  This is going to make a huge
difference to BO lovers.
 Just on this one test print I can see it's an
enormous improvement,
with a greatly reduced grainy look and retains the
luminance.  Now I
just need to finish working on the curve.  It's still
too blocked up
at the dark end.  I will post it as soon as it's done,
probably over
the coming weekend.  Wahoo!  Imahappycamper.  Why
didn't I try this
before???!!!!  Still need to test with other papers...

About the "Speed" setting: I printed a TrueTone ramp
with Speed set to
"Better" (still 2880), and it messed up the ramp,
introducing some
bumps and streaks into what had been a smooth ramp
using "Faster"


Regards,
Clayton


Info on black and white digital printing at    
http://www.cjcom.net/digiprnarts.htm




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