From: "Terry" <TerryGls@...>
To: <QuadtoneRIP@yahoogroups.com>
Sent: Tuesday, October 27, 2009 8:18 PM
Subject: [QuadtoneRIP] Re: Printing glossy b&w on R1800
> Bill ... your welcome.
>
> I should have added about the Gloss not printing on pure white (PS 255)
> which has been discussed in this group. The work-around is to take your
> final PS image and do an output levels adjust as follows:
> Image>Adjustments>Levels & set the bottom OUTPUT slider to 254.
>
> Also, I size my images to the output size I'm printing and 360dpi. Has
> anyone run tests to see if lower dpi's give acceptable results?
>
> Thanks, Terry
>
> --- In QuadtoneRIP@yahoogroups.com, "wpshumaker" <wmpshumaker@...> wrote:
>>
>> Thanks, Terry, for this very thorough post. I'll give it a try, for its
>> own sake and in the forlorn hope that it may affect my issue posted in
>> message 8109. Thanks in particular for the instructions on creating the
>> .acv curve, which has so far been a complete undocumented mystery to me.
>>
>> Bill
>>
>>
>>
>> --- In QuadtoneRIP@yahoogroups.com, "Terry" <TerryGls@> wrote:
>> >
>> > I've been pursing a similar objective with std Epson inks for the R800
>> > / R1800 and obtaining a somewhat neutral black or slightly warm tone on
>> > Epson Ultra Premium Luster paper with a high Dmax. Also, trying to
>> > address the bronzing issue with Gloss Optimizer.
>> >
>> > See my posts
>> > http://tech.groups.yahoo.com/group/QuadtoneRIP/message/8071 for some
>> > additional info.
>> >
>> > I'm using QTR on a PC with color management Adobe RGB(98) & Gray Gamma
>> > 2.2 (very important not to have Dot gain 20% or some other gray
>> > option).
>> >
>> > I determined the max PK ink density on the Luster paper occurred with a
>> > 63% ink amount with a densitometer reading of 2.54. I added Limit of 2
>> > for the other colors copying the PK curve, added a Gloss curve
>> > developed in Photoshop, and linearized using Chart Throb to obtain
>> > another curve in Photoshop.
>> >
>> > The details: Open Curve Creation in QTR (Tools>Curve Creation). Be
>> > sure your Printing Model shows up as QuadR800 or QuadR1800. Do a File
>> > Save as naming your profile which should be saved in Program
>> > Files>QuadtoneRip>Profiles>R800-uc>your file name.
>> >
>> > There are 6 TABS: Ink Setup, Gray Curve, Toner Curve, Toner 2 Curve,
>> > Linearization, and Notes
>> >
>> > On the Ink Setup TAB you want Default Ink Limit 100, Black Boost 100
>> > The Matte Black (MK) Drop down "Not used"
>> > Cyan Drop down "Copy curve from" PK 2
>> > Magenta, Yellow, Red, and Blue should be same as Cyan
>> > Photo Black (PK) Density 100, Limit 95 (you'll see in next TAB the
>> > Limit is much less due to the Gamma setting I'm using)
>> > Gloss (GL) Drop down "Load Curve" and Curve box shows up where you will
>> > load* a Photoshop .ACV curve, Limit 100
>> >
>> > *To create the Gloss curve in Photoshop: Open any image in PS and
>> > convert to Grayscale as QTR needs Gray .ACV curves. Add an Adjustment
>> > Layer and be sure the black is to the far left and bottom of the
>> > straight line (Curve Display Options set on Light, not Pigment/Ink).
>> > This will be an "L" shaped curve that I've found solves most of the
>> > bronzing. The points you can add are starting from the left side:
>> > Input/Output: 0;255 14;100 43;28 55;28 91;28 255;28. If you want some
>> > Gloss on the 100% black change the first setting to 0;250 and smooth
>> > the curve if needed. Save the .ACV curve naming it something simple as
>> > I've found QTR does not recognize all the names one could use in
>> > Photoshop. Again make sure this a Gray .ACV curve. Load this curve in
>> > the Gloss (GL) Curve Box.
>> >
>> > Next go to the Gray Curve TAB and enter Highlight 1, Shadow 1.4,
>> > Overlap leave blank, Gamma 5.1 (this reduces the maximum ink density to
>> > approx 63% and reduces the ink in the mid and lower values such that
>> > you need a very minimum Linearization approach. For now in the Curve
>> > space put "0;0 100;100" (I start with this and print out a Chart Throb
>> > step wedge, scan it to get a PS .ACV curve (gray scale) and then add
>> > the curve here.) My Curve here is almost a straight line and you will
>> > probably be happy without getting into the Linearization thing.
>> >
>> > We won't need the next three TABS (Toner, Toner 2, Linearization) and
>> > you can add information if you want to the Notes TAB.
>> >
>> > Now press the Show Curve box and QTR will ask if you want to Save Ink
>> > Description? Say Yes as you have pre-named your file and you won't be
>> > overwriting another file.
>> >
>> > Go to the Main QTR page and my settings are Printer: QuadR800 or R1800;
>> > Type: Photo Paper (I don't think this makes any difference); Curve 1:
>> > your curve created; Resolution: 2880 dpi; Speed: Uni-directional;
>> > Dither Algorithm: Adaptive Hybird
>> >
>> > I would appreciate any comments or suggestions.
>> >
>> > Terry
>> >
>> > --- In QuadtoneRIP@yahoogroups.com, "robert49brake" <robert49brake@>
>> > wrote:
>> > >
>> > >
>> > >
>> > > --- In QuadtoneRIP@yahoogroups.com, "arhodes19044" <spamiam@> wrote:
>> > > >
>> > > > Another option that I read abo9ut, and you may already know about
>> > > > is to print the photo in two passes. First print the black ink,
>> > > > then put it through the printer again using a different ink profile
>> > > > which just deposits 100% GLOP everywhere.
>> > > >
>> > > > I am not sure how drying time of the black ink will affect the
>> > > > GLOP. Should the glop be deposited ASAP, or should the black print
>> > > > be totally dry to achieve a more uniform appearance? Maybe it does
>> > > > nto matter at all
>> > >
>> > > 100% glop on a dried print will probably be too much and might
>> > > aggravate the dreaded pizza wheels. I would try down somewhere
>> > > around 35-40% and work on up to about 60% for second passes.
>> > >
>> > > I've found on most F type papers a curve that lays somewhere around
>> > > 80% glop initially and rapidly trails off to zero somewhere by 30%
>> > > will deal with most of the gloss differential. If you have bronzing
>> > > issues then you can try the second pass technique, as I say down
>> > > somewhere around 35-40 and work up until the bronzing is gone and
>> > > stop before it starts to puddle.
>> > >
>> > > From following Jon Cone's piezography forum it sounds like they are
>> > > using dedicated glop printers to lay down the glop in lighter spray
>> > > from multiple heads to make it even smoother.
>> > >
>> >
>>
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