QTR-Quadtone RIP

Hi and thank you guys so much for replay. Shilesh that's exactly what I
needed as far as white ink. Is there something I have to do with gray ,
tonner and tonner 2 tabs? Right now I have setup for gray tab: highlight 10,
shadow 10, overlap 100 and gamma 1. Tonner and tonner 2 settings are
highlight 10, shadow 10 and gamma 1?

Walker Blackwell I would really appreciate if you can explain a little
simpler since I am still not that handy with QTR. If this would work I will
be more than happy to send you guys some T-shirts J

Best regards

Bo

 

From: QuadtoneRIP@yahoogroups.com [mailto:QuadtoneRIP@yahoogroups.com] On
Behalf Of shileshjani
Sent: Sunday, January 24, 2010 12:23 AM
To: QuadtoneRIP@yahoogroups.com
Subject: [QuadtoneRIP] Re: Need help please!!!!

 

  

OK. Let's break this into two parts; I am surmising from Bo's initial
message that he intends to print with two passes (1) pure white with as much
ink as he can lay down, and (2) CMYK color image.

(1) with QTR is easy enough. If you dedicate Lb (more commonly called LK),
LC, and LM with white ink, and want to fire them at 100% each. Here is what
I would do. Create a curve setup file (qidf) with LK as gray, 100% density,
100% ink limit. Then setup LM, and LC as "copy curve from LK". Create the
profile. No need to linearize. Now when you print a pure black image through
QTR with this curve, you will be laying down the white ink in LK, LM, and LC
each at 100% ink limits (total 300% white).

(2) As far as I know, there is no way to do the color print from QTR. But, I
am eager to learn (although have no real use for it). A more full-featured
RIP can certainly allow you to build profiles that utilize only CMYK.

Shilesh

--- In QuadtoneRIP@yahoogroups.com <mailto:QuadtoneRIP%40yahoogroups.com> ,
Walker Blackwell <forums@...> wrote:
>
> Why wouldn't this work with QTR? Simply take a default environment 
> that uses K and LK (use two white inks-with similar density relation 
> to the Ks in Epson K2-instead of two black inks if possible, not three 
> white inks.) Then invert the 21 step linearization target and print. 
> Then you'll have to somehow invert the density values of each swatch 
> read against the central mean line between Darkest and Lightest patch 
> before you build the linearization for the white underbase profile. 
> You can batch this with a formula in Excel. *I can't quite get my head 
> around it until I would be sitting down and doing it, but this is a 
> starting point at least.
> 
> This will give you a linearized white environment. Then take the third 
> channel you were going to use for White and put nothing in it, an 
> empty cartridge (You will then tell your software that this is your K 
> channel even though it isn't printing anything). Then you simply build 
> a profile by printing a color swatch from Gutenprint using straight 
> CMYK (Lc Lm can probably not be there just fine). This gives you one 
> more channel to play with in case you ruin a channel with weird ink. 
> Just build a 300 patch profile (at max!) or so for the CMYK. Nothing 
> fancy. It will get very tricky to build the tables for the K vs CMY 
> on this ICC because they will be printed from different programs . . . 
> But, you should be able to apply the K part of the CMYK icc to the 
> white print and the CMY parts to the color print easy enough . . . 
> Will take a bit of tinkering I'm sure.
> 
> Should be good to go after this. Happy hacking,
> Walker
> 
> 
> 
> On Jan 23, 2010, at 4:26 PM, spopoviccacak wrote:
> 
> > I was wondering if any of you guys can help me. I had question in 
> > the past and this board was more than helpfull. I have epson 2200 
> > printer that I have converted to flat bad printer. It works great 
> > and if anybody needs info I can help you with it. I am planing to 
> > use it for printing on T-shirts. Only problem I have is printing on 
> > dark shirts. I can use QTR and setup LB, Lm and Lc chanels to print 
> > white underbase. I have setup curves Lb 100% ink limit gray ink, Lm 
> > 100% ink limit tonner and Lc 100% ink limit tonner2. Since I like to 
> > put as much ink as possible on the shirt should I setup Lc and Lm 
> > also to be gray ink or live it tonner and tonner2?
> > Most important question is: Since i would be using Lb, Lc and Lm for 
> > white ink is there any way I can have my CMYK chanels to print image 
> > without Lb, Lc and Lm. I know there are rip softwares out there but 
> > they are so expensive. Is it posible to create profile for epson 
> > 2200 that only uses CMYK channels for color images and profile for 
> > Lb, Lc and Lm so I can for example use photoshop to print white 
> > underbase and than switch profile and print color image on top of 
> > underbase. I am searching for almost two months with no sucess to 
> > either find some free rip software to do this or driver. If you guys 
> > have any sugestions please help me.
> > Best regards
> > Bo
> >
> >
> > 
> 
> Walker Blackwell
> 802.821.4451
> www.walkerblackwell.com
> aim: greendirtblues
> wblackwell@...
> 
> 
> 
> [Non-text portions of this message have been removed]
>





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