QTR-Quadtone RIP

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]