Decrease nozzles lead to the appearance of light stripes.

Hello!
I understand that I use gutenprint not in a very usual way, but hope for
your help!

I use it with epson xp15000 (6ch x 180nozzles) in bidirection mode.
When i modify xml and set 90 nozzles -
Light stripes start to appear on the image.

It looks as if, when the head moves in one direction, it dispenses less ink
than when moving in the other direction.

With unidirectional printing, this effect disappears.

To some extent, this occurs with all available rasterization algorithms.
But if you set it to 180 nozzles, everything becomes fine.


Perhaps you know what might be the issue or in which direction I should
look to find a solution to this problem?

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