QTR-Quadtone RIP

Hi Sean,

Others with more experience will probably chime in but, in the meantime, I'll suggest:

1)measure Lab L instead of density

2)try to achieve a fairly linear curve before you linearize. The linearization checker spreadsheet available here is a useful tool - http://www.piezography.com/PiezoPress/blog/piezography-k7-inks-and-curves/checking-your-linearization/

3)once you've achieved a fairly linear curve, measure Lab L once again and input that data into the curve's linearization 

Mark 


--- In QuadtoneRIP@yahoogroups.com, "supracode" <seanu@...> wrote:
>
> Hi everyone. I am new to QTR... so please be gentle. I recently acquired a Spyder 1005 Spectrocolorimeter. I decided to profile my setup which is as follows :
> 
> Epson 1400
> MIS EB-6 inks (6 carbon grey positions)
> PremiereArt Smooth Fine Art Paper
> 
> I've been using an Epson driver workflow up to this point, but I feel like I wasn't getting the full potential of the 6 inks.
> 
> After doing lots of reading, I created a custom ink/paper profile. I did the initial calibration to set the ink limits, with no linearization and recommended defaults. The initial 21 patch target looked pretty good... with good readings from the 1005 indicating increasing densities in all the patches, with the dmax around 1.63. I next followed the linearization procedure. After entering the density values in the linearization curve fields and reprinting the test target, I noticed no significant differences in the density readings. They were off quite a bit from the "optimal dmax" grid for the 1.63 dmax of the paper. It's almost as though the curve was not being applied. I tried a few things like closing and restarting QTR, and switching curves back and forth to make sure it reloaded my custom one.
> 
> Visually, the test chart appears to be too dark in the mid tones, and the patches are very close in appearance from 70 to 100. 
> 
> Any tips on what I should try next? Should I use the LAB L measurements instead of the density measures in the curve settings?
> 
> I don't have the profile here currently, but I can post it later tonight. Any ideas in the meantime?
> 
> Thanks - Sean
>