QTR-Quadtone RIP

Thanks for the prompt reply Mike

Yes, the longer left to dry the better.

I take your point re 1440 v 2880 - it probably doesn't make much difference with regard to the "look" of the print.

With regard to deleting curves not required, I can't even find the files if I do a search.

Mel

--- In QuadtoneRIP@yahoogroups.com, Mike Finley <mike.finley@...> wrote:
>
> 
> 
> On 11/01/2012 12:06, Mel wrote:
> >
> > This is really related to my other recent posts and is an attempt to 
> > further understand the process.
> >
> > This is how I re-linearized QTR_1400_UT14_IGFS_ cool and warm using 
> > MIS inks to make a curve for Epson Premium Semi Gloss paper 
> > (EPSG)using Windows 7.
> >
> > 1. Open the QTR programme.
> > 2. Click on Tools>Curve Creation.
> > 3. Click on File>Open>QTR_1400_UT14_IGFS_cool.qidf
> > 4. Click on Open.
> > 5. Click on Linearization.
> > 6. Click on Clear.
> > 7. Click on File>Save As>QTR_1400_UT14_EPSG_cool.qidf
> > 8. Exit Curve creator.
> > 9. Return to the QTR programme.
> > 10. Click on File>Select Image>(navigate to the appropriate folder for)
> > 21step.tif and click on this.
> > 11. Select A4, Portrait, 2880 dpi, Uni-directional and the new
> > QTR_1400_UT14_EPSG_cool.qidf making sure Curve Blending is at 100%
> > and 21step.tif is placed near the top of the page (to allow for
> > subsequent print offs).
> > 12. Place an A4 sheet of Epson Premium Semi Gloss in the printer and
> > click Print.
> > 13. Allow to dry for several hours.
> > 14. Measure the steps (I use an X-Rite 810).
> > 15. Open Curve Creation again and navigate to
> > QTR_1400_UT14_EPSG_cool.qidf and open it.
> > 16. Click on Linearization (it should be empty).
> > 17. Enter the measurements from 21step.tif, starting top left with
> > the "white" (paper white)measurement, following horizontally to the
> > right, then following from left to right on the next line. The
> > final value (black) on the third line at the left end.
> > 18. Save this as QTR_1400_UT14_EPSG_cool.qidf and Exit Curve
> > Creation.
> > 19. Return to the QTR programme and open
> > QTR_1400_UT14_EPSG_cool.qidf,set the parameters as before and print
> > off 21step.tif below the first one on the paper.
> >
> Looks good, except:
> 11. I use 1440 dpi as i found some anomalies in the density graph when 
> building curves from scratch at 2880 dpi. I *think* the supplied curves 
> are usually for 1440 dpi
> 13. I leave 24 hours - I've not tested whether this is necessary, as its 
> probably going to vary from paper to paper (and ink to ink) anyway.
> >
> >
> > I would like comments on this approach using these papers, especially 
> > from Roy, Tom and David if possible.
> >
> > I made a few "trial" linearization curves using 
> > QTR_1400_UT14_IGFS_cool.qidf as a basis but these don't appear in the 
> > Profiles folder of Windows Explorer - why would this be so as they 
> > appear in the QTR programme, Curve Setup, drop down menu? The "trial" 
> > linearization curves also appear here, even though I managed to delete 
> > them in Curve Creator - how do I delete them in the QTR programme (I 
> > am using 2.7.0.0 for Windows)?
> >
> They don't appear in the Windows profile directory, as they aren't ICC 
> profiles for general use in graphics programs, they are curves purely 
> for use when printing with QTR (using qtrgui in the case of Windows - 
> unlike Macintosh computers you can't print with QTR direct from 
> Photoshop etc.). You need to be careful reading instructions on how to 
> use QTR - its different on the two platforms. I'm not at the right 
> computer at the moment, so can't tell you how to remove the curves - I 
> think you just delete a file in a particular directory, but would need 
> to look it up.
> >
> > 
> 
> -- 
> mike finley photography
> http://www.mikefinley.co.uk
> http://words.mikefinley.co.uk
> 
> 
> 
> [Non-text portions of this message have been removed]
>