12-02-2018, 06:31 PM
Honestly do not know from your description 
It could be a one pix line using the paint tool. That will introduce anti-aliasing into adjacent pixels.
Can be removed using the threshold tool - colours menu - but...
![[Image: tDXBp8J.jpg]](https://i.imgur.com/tDXBp8J.jpg)
really need more information.

It could be a one pix line using the paint tool. That will introduce anti-aliasing into adjacent pixels.
Can be removed using the threshold tool - colours menu - but...
![[Image: tDXBp8J.jpg]](https://i.imgur.com/tDXBp8J.jpg)
really need more information.