I need to make a couple of corrections: The PK ink density of 2.54 occurred at 100% ink amount (not 63%) This line: 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) Should read The PK Limit is still 95 (and 100% Black Boost) but the ink curve appears to max out at 63% since the high Gamma setting in the next TAB forces the ink curve to the far right and "parallel" to the right axis. Also this line: 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. Should read Gamma 5.1 (this appears to reduce the maximum ink density to approx 63%, but it is still 95/100 as the curve runs parallel to the right axis) Sorry for the mix-up. Terry --- In QuadtoneRIP@yahoogroups.com, "skip crawford" <auntskip2@...> wrote: > > 360 is native resolution for the smaller format epson printers.....at least > thats what it was 18 months ago which would include the 1800........and > there can be some difference seen on them in some instances as opposed to > 300 > ----- Original Message ----- > 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. > >> > > > >> > > >> > > > > > > > > > > ------------------------------------ > > > > Yahoo! Groups Links > > > > > > > > >
Message
Re: Printing glossy b&w on R1800
2009-10-31 by Terry