Can a Custom Pencil Brush include Transparency?

[Blighty]

You have just discovered the difference between the Pencil and the Paintbrush. The Pencil is a hard brush ie it does not have antialiasing pixels around the edge. The Paintbrush is a soft brush. It does has antialiasing pixels around the edge. This can be set by choosing a suitable brush. For example, the different circle brushes with hardness 0.50, 0.75, etc.

For both the Pencil and Paintbrush have a look at the Tool Options. There is an Opacity slider. This will affect all the pixels, not just the edge pixels.

Also see here:
https://www.gimp-forum.net/Thread-Where-...Windows-10