QTR-Quadtone RIP

Hi all,

I'm sure I've missed something somewhere! I've done my transition of Ink setup for 4 inks. Now i've got a 1 to 100 step wedge in increments on 1. Now in the Linearization part of QTR there are 60 values to enter?
The top left starts at 1 of my step wedge which is the whitest part. Now the first line is what, 1 to 10?
Then the next line is increments of 2 ? From 11 to 20? for the first 5 colums? Then the next column 21 to 30?
Then go to the 3 row, then start from 31 to 40. increments of 2 etc etc
The last row, 6th one, is that 91, 92, 93, increments of 1?

Thanks
jag24x

The steps must all be evenly spaced starting from 0 (paper white) and 
finishing at 100 (dmax). You could use every second step on your 0-100 
step wedge (ie 51 values) but most people just use 21 steps in intervals 
of 5. Make sure there are no reversals in the steps.

Howard

Howard Shaw
glassman@...
www.howardshaw.org


jag24x wrote:

> Hi all,
>
> I'm sure I've missed something somewhere! I've done my transition of Ink setup for 4 inks. Now i've got a 1 to 100 step wedge in increments on 1. Now in the Linearization part of QTR there are 60 values to enter?
> The top left starts at 1 of my step wedge which is the whitest part. Now the first line is what, 1 to 10?
> Then the next line is increments of 2 ? From 11 to 20? for the first 5 colums? Then the next column 21 to 30?
> Then go to the 3 row, then start from 31 to 40. increments of 2 etc etc
> The last row, 6th one, is that 91, 92, 93, increments of 1?
>
> Thanks
> jag24x
>
>
>
> ------------------------------------
>
> Yahoo! Groups Links
>
>
>
>
>

--- In QuadtoneRIP@yahoogroups.com, Howard Shaw <glassman@...> wrote:
>
> You could use every second step on your 0-100 
> step wedge (ie 51 values) but most people just use 21 steps in intervals 
> of 5. Make sure there are no reversals in the steps.
> 

Actually, even 51 steps may be too many. QTR is not only sensitive to reversals. It also complains if the steps are too small (it just thinks they are reversed). This happened to me regularly when I tried to use 51 steps. So I reverted to 21 steps as most here do as Howard pointed out. That's sufficient to have a good linearization.

Joost