Gimp-Forum.net

Hi,

I'm trying to make a custom brush with a gradient and then use the paintbrush tool with the "Track Direction" dynamics to give the gradient to a line that I'm drawing. The brush works fine without dynamics, but when I apply the "Track Direction" dynamics, I get these weird artefacts. Per the image below:



I attach my brush, in case it's something I've done wrong making the brush.

I do not think you have done anything wrong, look like it is associated with this post https://www.gimp-forum.net/Thread-Brush-problem--5967 and this bug https://gitlab.gnome.org/GNOME/gimp/-/issues/5509

What you can try is trim the brush into a circular shape so that edge rotation is negated. your trimmed brush attached. Use a small brush spacing, you still get boundary change edges but not the black pixels. Try working at a higher precision than 8bit - might help.

[attachment=9712]

Thanks very much rich2005!

Still getting artefacts my end with your updated brush.

Is there something else I'm doing wrong?

I honestly do not know. There is an issue with rotating a brush and generating those edge pixels. AFAIK not fixed.

This an animation of the default settings using that round brush, which has a transparent border.

https://i.imgur.com/AdszRVu.mp4

When you post a screenshot of a problem, always best to show the whole Gimp interface.

Maybe someone will come up with better advice.

You are doing nothing wrong, it's just unusable, if you can report it over there https://gitlab.gnome.org/GNOME/gimp/-/issues > maybe, they will try to fix it.

30-second video > https://imgur.com/q0lnQ8e

The "only" thing I came across is to shrink the selection before Ctrl+C, but even though, it's far from perfect as you can see below

[attachment=9714]

I also noticed changing the original/default size will worsen the black dirt