08-04-2019, 09:07 AM
I have no idea what Bounding Box Materialize is; not the relevance of 8 bit 32 bit in this situation.
What is apparent is that your texture pattern is not seamless. This will account for lines where the pattern edges touch.
Take your image and do:
Layer > Transform > Offset > W/2,H/2
The harsh lines are immediately visible.
There are various ways to make seamless patterns. One way is to use Filters > Map > Tile Seamless. But this does not work very well with this particular pattern. Could be made better by cloning. Or G'MIC has some Make Seamless filters, they could be better on this pattern.
What is apparent is that your texture pattern is not seamless. This will account for lines where the pattern edges touch.
Take your image and do:
Layer > Transform > Offset > W/2,H/2
The harsh lines are immediately visible.
There are various ways to make seamless patterns. One way is to use Filters > Map > Tile Seamless. But this does not work very well with this particular pattern. Could be made better by cloning. Or G'MIC has some Make Seamless filters, they could be better on this pattern.