You will need:
A Windows PC (XP,7,8,10)
Adobe Photoshop (Optional)
Photoshop brush file (.abr)
Clip Studio (Manga Studio 5)Step 1
Download and install AbrMate (Free)
Click "Open Brush Set" and select the PS brush you want to convert.Step 3
Wait for the brushes to load into the program.
Click the "Export All Open Brushes to .pngs" and save them in a new folder.
Open Clip Studio.
File > Open > Select one of the .pngs you just created.Step 5
Open the Layers Window. (If you don't see it open it via Window > Layers)
In the upper left corner of the Layers Window, click the arrow icon with 3 little lines beside it.
Select "Convert Layer(H)..."
A "Convert Layer" box should pop up.
Change the "Expression color:" from Color to Gray. Click OK.