Paint > Setting Brush Attributes and Modes > Brush Attributes >
Brush Pressure

The brush pressure affects the transparency of the paint applied to the image. To apply opaque paint, use a high percentage value. For more transparent paint, use a low value.

The Pressure attribute differs from the Opacity attribute in that you can set the Pressure attribute mode so that the paint transparency varies according to the pressure applied to the pen or the direction of the brush.

NoteYou can use any attribute mode with the Pressure attribute.

Pressure attribute value at 100% | Pressure attribute value at 50%