I've had success printing direct to plate using QTR on the 3800. You have to use MK in the blend. I also used yellow, cyan, light cyan and light black. When I tried the profile on the 3880 and P800 I started getting some odd spotting on the plates. Don't know if there was some incompatibility with the HD inks and the polymer but is was a consistent problem. For those printers I use an aquatint screen first to put the bite into the plate and have a calibration using only cyan ink to print direct to plate. I had tried using PK inks in the calibration without success until Stig Stassen turned me onto the MK trick. Alan > On Sep 3, 2017, at 12:23 PM, 'forums@walkerblackwell.com' forums@... [QuadtoneRIP] <QuadtoneRIP@yahoogroups.com> wrote: > > Make a “noisy” negative using a specific dither. Or print directly onto a polymer plate with 1 channel using a slightly different dither. > > One way to do this is the print directly onto the plate with Matte black ink using the Epson (or QTR) driver and only 1 channel of ink. This creates the proper amount of pure dots. We are working on something that will be a bit more ideal for that but it is competing with lots of other things on our plates (sorry for the pun). > > I’m sure Don Messick could elaborate if he was on this list. > > Best, > Walker > > >> On Sep 3, 2017, at 12:16 PM, Jon Goodman jon@... [QuadtoneRIP] <QuadtoneRIP@yahoogroups.com> wrote: >> >> >> Thanks. Wouldn't "Bite" be provided by either the gravure screen or aquatint. The gravure screen is a separate exposure, the aquatint is a physical entity. I am not clear how the gravure positive is made differently in those terms. The screening inherent in inkjet film has never seemed to have any noticeable difference from analog film. >> Jon >> >> Sent from my iPad >> >>> On Sep 3, 2017, at 11:35 AM, 'forums@...' forums@... [QuadtoneRIP] <QuadtoneRIP@yahoogroups.com> wrote: >>> >>> >>> >>>>> "BITE" acronyms for? >>> >>> >>> Or more specifically the bite is simply referring to the divits and the “bite size” is their width, “bite depth” their depth, etc. It all gets wrapped under one term I guess is how I see it. I’m no expert at all so others should correct me here if I’m wrong . . . >>> >>> Best, >>> Walker >>> >>> >>>> On Sep 3, 2017, at 9:34 AM, forums@... wrote: >>>> >>>> TIL means total ink limit (how much actual ink goes down per tone). Bite is how separate and defined the divits are in a gravure plate. Bite is not an issue with other types of printing. In fact, with most processes you are looking for the exact opposite (a very smooth grainless negative). >>>> >>>> Best and cheers, >>>> Walker >>>>> . >>>>> >>>>> >>>> >>> >>> >> > >
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Re: [QuadtoneRIP] The limits of working with QTR
2017-09-03 by Alan Vlach