Gray box around brush preset problem

[default526cpxagmqb9]

Hi, 

I followed a tutorial to make a custom brush but everytime I draw, a light gray box is present within the brush strokes. The grey box even shows in the small brush picker icon. When I defined the brush preset it was on a solid white background. 

Would appreciate any insight on how to get rid of the box around the brush!

 

[Bojan Živković]

Can you post screenshot of file where you are defining brush preset?

[default526cpxagmqb9]

Hi here's a screenshot. For clarification the reason why I'm defining the brush preset on a white background is because to achieve the custom brush I apply filter gallery on a regular soft round brush. The tutorial I'm following doesn't have the gray box. I could link the tutorial if that would help. 

[Trevor.Dennis · Accepted solution]

The area around the brush preset you are trying to create must be full white or transparent.  It looks like you had a light gray background when creating the new brush preset, and that has been incorperated into the preset.  If you copy the image below to Photoshop and use it to create a new brush preset, the grey box will bee gone