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Vertical lines in prints

Posted: Sun Mar 05, 2017 6:29 pm
by fortiernor
I've been using TP for several months and I just realized that my prints contain a series of vertical lines made up of dots that reflect light, roughly every 2 cm, a single line alternating with a double line. These are only visible with light coming at a steep angle from above.
I have tried setting ink limit to 240% instead of 300%, that did not help.
With Epson P800 on Canson Baryta Photographique, using zedonet profile.
Any possible explanation or suggestion to correct this?

See example here: ... s.jpg?dl=0
(due to the difficulty of photographing this problem, lines in the above are only visible in the middle but as a matter of fact they do range throughout the whole width of the picture).

Re: Vertical lines in prints

Posted: Thu Mar 30, 2017 7:41 am
by zedonet

sorry for not answering earlier - I somehow missed your post.

As far as I can tell these are "starwheel marks" that cannot be prevented from the printer driver side. The starwheels hold down the paper before it leaves the printer so that it doesn't touch the print head. They may be less prominent when using a different photo paper and are probably inivisible on matte paper.
starwheel-marks.jpg (112.98 KiB) Viewed 3759 times
I found this post explaining the topic, there is also a link to an article that describes how to remove the star wheels (altough I wouldn't do that): ... 80-vs-P800

Re: Vertical lines in prints

Posted: Wed Oct 11, 2017 4:54 pm
by fortiernor
Thank you for the link. I just found your answer as I only experienced this problem with this particular picture.