I've been pursing an objective with std Epson inks for the R800 / R1800 to obtain 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. I'm using QTR on a PC with Color Settings>Working Spaces Adobe RGB(98) & Gray Gamma 2.2 in your Gray Drop Down Box. I determined the max PK ink density on the Luster paper occurred with a 100% 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 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. 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 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) . 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
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Printing Glossy / Luster B&W on R800 / R1800
2009-11-04 by Terry
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