How Do I Make This?

[Krikor]

(09-29-2020, 09:07 PM)green61 Wrote: I want to use images like this, the black and white images, as alphas for ZBrush. I can't find out how to make them. Can you make them in GIMP? https://www.textures.com/download/3dbrush0089/127532

I didn't log in to the site, so I couldn't download the textures available on the site.
Using a low resolution copy of the image from the link provided I was able to create some brushes.