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EPSON L800 -> Slightly visible line artifact

Posted: Thu Mar 24, 2016 4:48 pm
by timur_davletshin

First of all I am newbie with TurboPrint. I just purchased license for my Epson L800 and had chance to play with new driver for several days. My printer is not officially supported by TurboPrint but this printer is just T50 equipped with continuous ink system. So it runs with Epson_StylusPhotoT50 driver on my Ubuntu 14.04 LTS 64bit system (it runs OK excerpt random ink level). Inks and paper are all original by Epson.

I'm very satisfied with general quality and capabilities of new driver, thank you very much for this great software. It is incomparably better in terms of color management and color reproduction.

But I just noticed that my prints with light background have strange artifact which looks like darker line on 5-6 mm distance from sheet side which comes from printer first (parallel to head movement). It is not nozzle or any hardware problem since there is nothing like that when I print with official Epson driver. This line is barely visible but it does exist on prints with light background.

See link below. This is the same file printed with TurboPrint (1 and 2) and official Epson driver (3). Print #1 just marks with yellow position where you can see slightly darker line on print #2, and no line on print #3 (a bit more saturated due to something called "Epson Vivid" color profile). ... sp=sharing

Print log: ... sp=sharing

P.S. #1: I print from Gimp via TurboPrint plugin.
P.S. #2: I tried to disable GSZEDO - no changes, still I see artifact.

Re: EPSON L800 -> Slightly visible line artifact

Posted: Fri Mar 25, 2016 5:48 am
by timur_davletshin
I did another experiment to exclude GS problem by printing directly with

Code: Select all

tpprint ... image.ppm - | lpr -o raw -P printer
and I still have this line. I took tpprint parameters from print.log

Re: EPSON L800 -> Slightly visible line artifact

Posted: Tue Mar 29, 2016 9:26 am
by zedonet

thank you for your detailed problem report!

When the printer is in borderless mode, the driver has to take care that only a part of the print head is used during page start and page. This means that the paper is advanced in smaller steps at the page edge and in larger steps during the page. There is a transition between these zones which is probably not "smooth" enough which causes the visible artefact - a slightly visible difference in color intensity. We will try to improve this in a future TurboPrint release.