QTR-Quadtone RIP

It is possible to produce a QTR curve that lays down ink in a linear fashion, then you can use pdn or something similar to produce a grey curve to apply in QTR. I use 50% photo black, 26% Yellow and 25% Cyan for a total ink limit of 101%. The step wedge may print with pizza wheel marks or banding because printers dont like to lay ink down that way, but once you have applied a grey curve the ugliness goes away. You apply the same curve to all the colours used to maintain the 50,26,25 ink ratio. If you want less density you can cut the PK % down and increase the others, say 33% each, if you need less again cut the total ink limit and proportional limits. Vivid magenta prints with less grain than cyan, in the above recipe but produces less density. Do a manual head align before you start.

David



________________________________
 From: Alan Vlach <alanvlach@...>
To: QuadtoneRIP@yahoogroups.com 
Sent: Tuesday, 27 December 2011 11:21 AM
Subject: Re: [QuadtoneRIP] PDN system and QTR
 
Check out Ron Reeder's site. He has a procedure for making negatives with QTR. I use QTR and Mark Nelson's Curve Calculator software to execute the steps and calculate the curves. PDN itself is based on the use of color (and no black inks) to create smooth tonalities in the digital negative. I have used it extensively and it is an excellent method to make negatives, but is patented ( you can't teach it without permission which he only gives to university professors or use it for profit without paying a commission) , and, since I teach workshops in making negatives I have switched to using QTR. Ron Reeder's method mixes all the inks when making a negative and I feel the results are as good as PDN. The only downside is that PDN is very stepwise and straightforward during the calibration process whereas there is a lot of testing and guesswork to determine the right ink mix using QTR when mixing all the inks. 

Hope this helps

Alan


On Dec 26, 2011, at 3:22 PM, mysteriousmirage wrote:

> Hello,
> 
> Has anyone had expereince using the Mark Nelson Precision Digital Negative system with QTR? If so, what has been your expereince? 
> 
> Thanks,
> 
> -Ted
> 
> 



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



------------------------------------

Yahoo! Groups Links



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