Digital BW, The Print

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "andrevallejo" <vallejodasilva@...> wrote:
>

> The only thing I can't figure out is how to make the printer spray the GLOP over the print using QTRip...

Here is a method for overcoating that will work with a glop channel using a Mac, there may be some adjustments needed for Windows.  In PS open a new 360 Pixel/inch, white background, 16 bit,  rgb image that is the same size as the  print you want to over coat.  Add a Levels Adjustment Layer  and change the 255 output to 254.  (QTR sees white 255 as no ink).    Save that image and use it later to "print" glop over another image

Now open any QTR profile for your printer.  They will be the txt files located under Applications>QuadTone RIP>Profiles>(your QTR printer name)  Keep the line that says N_OF_INKS=.  Set the default ink limit to =100.  Go through the other Limit/Boost settings and change all to =0 except the channel that is being used for the Glop, change that to =100.  

Disable every other setting that follows in the profile.  You can do this quickly by going line by line and erasing everything to the right of each = sign.  If a value needs to be in the profile, QTR will automatically add a mid value back in and they will have no effect.

After all of the TONER sections add the line:

CURVE_(X)="0;100 100;100"""

Where X equals the channel that contains the Glop.  For example:

CURVE_M="0;100 100;100"""

assumes that the Glop is in the Magenta channel position and that curve will add 100% glop over the entire image.  A curve of ="0;0 100;100"""  would add no glop in the highest highlights and ramp up on a diagonal line to 100% glop at the black end.

 Similarly a curve of ="0;60 100;60""" would add 60% glop across the entire image.  The rule that must be applied is: immediately after the = sign is " (open quote) followed by the first point, 0 in this case,  followed by a ; (semicolon) followed by the second axis value, 60 in this case, followed by a single space, followed by the next point, 100 in this case, ; ( semicolon), second axis value, 60 in this case, followed immediately by triple end quotes """

Any number of points can be added on the curve as long as the format is followed ie:  ="0;100 50;80 100;30"""

Now save the text file with a name particular to the curve.  Remember to keep the Name of the printer first and text to follow with spaces taken up by _ (underscores)  As in this example for an R1800:

R1800_GLOP_100_FULL.txt

Save that file in the QTR folder for that printer, run the Install command for that folder.  You should then have installed that profile for that printer.  Restart PS to install the profile in PS.

Open your blank image in PS and print as you would for QTR selecting the glop profile from the drop down list.