QTR-Quadtone RIP

Hi Robert

Just about to start using the Epson 1400 with UT14 ink set and David's curves and notice that GLOP isn't used in the semi and glossy papers.

I note your suggestions below and wonder if you could clarify a couple of points.

If you only use GLOP in the highlights does that not give a different "texture" to the print where it is used, as opposed to where it is not used.

Also if the line CURVE_Y="0;50 100;50""" is used do I still need to change the output to 254, or is this just for the CURVE_Y="0;80 50;20 100;80""" and CURVE_Y="0;80 7;9 11;2 100;0""" you use.

Mel

--- In QuadtoneRIP@yahoogroups.com, "robert49brake" <robert49brake@...> wrote:
>
> --- In QuadtoneRIP@yahoogroups.com, "Randy Rancier" <randy_rancier2004@> wrote:
> >
> > My question is how to apply the GLOP along with another ink???  I'm not sure how this is 
> > done....
> 
> > I am using the GLOP  in the Y position on Ilford Gold Fibre Silk paper which is a semi-gloss 
> > or luster type baryta coated paper. 
> 
> Randy, you can add the line:
> 
> CURVE_Y="0;50 100;50"""
> 
> at the end of your text file before the linearization.  This will lay 50% Glop across the entire image and is for form 
> only.   I don't know how much Glop you will actually need or where you will need it.  Variations on the form might be 
> things like:
> 
> CURVE_Y="0;80 50;20 100;80"""   will describe a "U" curve laying down 80% Glop in the highlights for gloss 
> differential, 20% Glop at the midtones and 80% Glop again at the 100 percent mark.
> 
> The only Glop curve I use is:
> 
> "0;80 7;9 11;2 100;0"""  which only lays glop in the highlights on Gold Fibre that I use with a different inkset.
> 
> There is one caveat with Glop being used in this manner.  QTR will not lay any ink down at points in a channel that 
> register 255 (pure white).  The work around is, make sure your image is in Grayscale.  Then add a levels layer on top 
> of all other layers.  In the levels layer at Input 255 change the Output to 254.  This will bring down any specular 
> highlight to within 254 and keep the Glop laying and preventing gloss differential in the highlights.
> 
> I find the easiest way to define the curve is to open any Grayscale image in PS, then open a Curves Layer and define 
> the curve on that layer.  After defining the curve you can transfer the points in the form 
> "horizontal;vertical<space>horizontal;vertical<space>h;v and so on, then end with """    There should be no spaces 
> in the line except between defined points.
> 
> Another way of installing the curve into the text file is to save the ACV Curve then drag and drop the file and its path 
> onto the CURVE_X= line such as:
> 
> CURVE_GL=/Users/RPB/Desktop/1800-ACVs/GLOP2.acv
> 
> which sends the text file on my machine looking at that path to find my ACV file called Glop2.  One small caveat 
> here is to always keep your ACV files in the same folder or later modifications of the same text file will not be able to 
> find the curve and will flag an error.  I find this is easiest to do if you have your text file open and finder open in LIST 
> view where your ACV file lives.  Simply click on the ACV file name and drag it to your text file, when it is next to 
> CURVE_Y= that line will become active and when you drop the file the path will be present.  Also the reason you 
> need to keep your ACV files in the same place.
> 
> Good luck!
>