Digital BW, The Print

Paul and Carl,
  I am following your test & trials... very exiting !!!
  Do you believe You'll succeed by keeping the color printing of the R1800 and giving us the way to print good B&W?
  Are you testing with the PK and BK and  with the Gloss head ? why not...? meaning three blacks... QTR is right for that...
  Does the Gloss head have the same dot size? If yes, I could live without any Gloss on my Color prints... it's possible to print on "Pearl" paper type without any gloss...
  thks for your efforts and good luck, I am waiting and confident...
  BTW a shake hand from Paris

Paul Roark <paul.roark@...> a écrit :
          PKN is also loaded with C & M, which defeats most of what I'm after. For
snaps and postcards, however, it may be a way to utilize the extra jets.

Paul

www.PaulRoark.com <http://www.paulroark.com/> 

_____ 

From: DigitalBlackandWhiteThePrint@yahoogroups.com
[mailto:DigitalBlackandWhiteThePrint@yahoogroups.com] On Behalf Of Carl
Schofield
Sent: Wednesday, May 09, 2007 7:25 AM
To: DigitalBlackandWhiteThePrint@yahoogroups.com
Subject: Re: [Digital BW] R800-1800 pure carbon printing

Paul,

Sounds very encouraging. If I can get some empty carts I will do 
some experimenting with my wife's R380 printer if Roy has this one on 
his list. I use MIS PK in my 4000 and 2400 and it is very warm as a 
BO print. PKN give a neutral/cool BO print.

Carl

On May 9, 2007, at 12:15 PM, Paul Roark wrote:

> Hi Carl,
>
>> The Epson 4000 driver dither is already quite good
>> with just single channel BO so it might be a good
>> candidate for multiple Eboni channels.
>
> I've been testing my 2200 with multiple Eboni ink channels as well 
> as the
> 1800. In general, the multiple channels can greatly reduce or 
> virtually
> eliminate microbanding, but it does not smooth out the grainy 2200 
> midtones.
> So, the graininess you see with BO is probably what you'll get with 
> multiple
> Eboni channels. The larger dots to print slightly more neutral, 
> which I'd
> say is an advantage. However, the 1800 Eboni prints on non-brightened
> Premier Art Smooth (Hot Press) 325 are definitely a tone I can live 
> with --
> just slightly warm.
>
> The very light tones are actually better with a single channel 
> firing. I'm
> getting close to "perfect" 1800 images (with a barely visible fine 
> grain
> structure) by having a single jet fire to 25%, another one start 
> there,
> another at 50%, and another at 75%.
>
> How many channels are optimum is still an open question. From what 
> I've
> seen 3 may be a bit too little, and more than 4 may not result in any
> visible improvement. Whether the extra 1800 channels are useful is 
> an open
> question. So far I'd say that as soon as Roy gets the new 260 and 
> 1400
> going, they'll make good candidates for this approach.
>
> Have you done a BO print with Epson PK? I'm wondering how neutral 
> it is.
>
> I'm using QTR for this, with curves simply entered in the point 
> lists. The
> channels are not partitioned, since they are all the same density. 
> The inks
> never go into a negative slope. Right now most curves are essentially
> straight lines, with the caveat that I make the starting points of 
> all but
> the first one more gradual than a straight line would be. The last 
> curve,
> which carries much or the black, has a highly increasing slope. I'll
> probably come up with a more or less overall slope and then figure 
> out how
> to make the system more simple and equalize ink usage somewhat. 
> Right now I
> have not figured the areas under the curves.
>
> I'll be sending this defective 1800 back soon, but, again, I think 
> for those
> interested in a pure carbon print that will not suffer from the 
> inevitable
> differential fade of the magenta & cyan color pigments, it 
> tentatively looks
> like a viable solution for up to 13 x 19.
>
> Paul
> www.PaulRoark.com

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BTW Have nice prints with QTR
don't forget  "Life is just what we are looking for..."

R1800 mostly in B&W (80%)
Lyson Inks R8
Moab papers

JCP
 	      
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