QTR-Quadtone RIP

And still further

My further thoughts on Ilford Gold Fibre Silk v Epson Premium Semi Gloss or Epson Premium Lustre for that matter.

>I favoured the Epson Premium Semi Gloss paper as it is a brighter white - the Ilford Gold Silk is a creamier paper.

I have revised my comments made above. Although  the IGFS is a "creamier" paper, compared with either the EPSG or EPL it seems to produce better, brighter whites than the other two and a warmer/neutral print for the same ink settings. I would suggest adjusting the ratio of cold/warm ink settings for the Epson papers to 60%/40% if you required a warmer "look" to your prints than 75%/25% produces. 

The EPSG and EPL papers are a "colder" blue grey white, giving a reading of 0.09 D (the plaque standard on my X-Rite 810), whereas the IGFS gives a reading of .04 D - more reflection and a brighter white.

So I think on balance I prefer the IGFS paper and by the way, it is heavier, 310gsm, compared with EPSG, at 251gsm and EPL at 250gsm. 

--- In QuadtoneRIP@yahoogroups.com, "Mel" <chilterns@...> wrote:
>
> Still further on this topic, I posted the following in two replies in the Digital Black & White forum (should have been here first I think since it is a QTR topic).
> 
> I re linearized David Goldenberg's IGFS profiles(QTR_1400_UT14_IGFS_warm and QTR_1400_UT14_IGFS_cool) for the Epson Prem Semi Gloss using an X-Rite 810. The plaque of the 810 gives a reading of 0.09 D on the white spot and 1.79 D on the black spot. These are the correct readings for this plaque's reflection standard. When reading "paper white" the 810 also reads 0.09 D, which is what I would expect.
>  
> These were the readings I got using the 810, QTR_1400_UT14_IGFS_cool and Epson Premium Semi Gloss paper.
>  
>  .09
>  .15
>  .20
>  .25
>  .29
>  .33
>  .38
>  .43
>  .47
>  .50
>  .52
>  .58
>  .65
>  .73
>  .81
>  .90
>  1.01
>  1.19
>  1.34
>  1.53
>  1.81
>  
> I then opened QTR_1400_UT14_IGFS_cool in Curve Creator, cleared  Liearization and entered these figures and saved it as QTR_1400_UT14_EPSG_cool.
>  
> Looking at the curve for the result it doesn't look very linear (David's curve for the IGFS is virtually a straight line).
> 
> Not satisfied with this I then printed a further 21step.tif with this file, remeasured the steps and entered these measurements into the Linearization Values of Curve Creator saving this as QTR_1400_UT14_EPSG_cool1. When I clicked on Show Curve, to my amazement I got a nearly straight line - just a slight wave in the middle. 
> 
> I did the same with QTR_1400_UT14_EPSG_warm and called it warm1 and got a good straight line, identical to David's QTR_1400_UT14_IGFS_warm. As this was a better curve than the QTR_1400_UT14_EPSG_cool1 I replaced the cool1 values with the warm1 values to produce the same straight curve and called it cool2.
> 
> If the object of the exercise is to produce a straight line "curve", have I, in using this method achieved the right result ?
> 
> --- In QuadtoneRIP@yahoogroups.com, "Mel" <chilterns@> wrote:
> >
> > Further on this topic, I have printed off the 21step.tif using QTR_1400_UT14_IGFS_cool and a blend of QTR_1400_UT14_IGFS_warm and QTR_1400_UT14_IGFS_cool (75% cool and 25% warm and) and find bronzing on the black end of the step wedge. This is only on the 100% patch and only seems to be in daylight. None of the other patches are affected and it doesn't appear when viewed in artificial (incandescent) light. 
> > 
> > I also did the same using the same profiles with Epson Premium Semi Gloss paper, with the same result.
> > 
> > When using Epson Premium Semi Gloss paper with the Epson 1290 and the 1290 profiles with UT2 inks there was no bronzing - alas the 1290 "gave up the ghost" and is no more.
> > 
> > Is there a satisfactory explanation for this and/or could UT2 inks be used with the Epson 1400.
> > 
> > I favoured the Epson Premium Semi Gloss paper as it is a brighter white - the Ilford Gold Silk is a creamier paper.   
> > 
> > --- In QuadtoneRIP@yahoogroups.com, "David" <dpgoldenberg33@> wrote:
> > >
> > > No.  
> > > 
> > > The profiles do not include glop (in the "yellow" cartridge in UT-14), and there should be no need for spraying. (I've never actually tried it.) The profiles use the glossy-compatible photo-black ink and no ebony.
> > > 
> > > David
> > > 
> > > 
> > > 
> > > --- In QuadtoneRIP@yahoogroups.com, "Mel" <chilterns@> wrote:
> > > >
> > > > One for David (dpgoldenberg33) really
> > > > 
> > > > Does QTR_1400_UT14_IGFS_warm and QTR_1400_UT14_IGFS_cool, require "glop" or spray application ?
> > > >
> > >
> >
>