Blur Brush ToolYou can use the Blur Brush Tool to blur hard edges within an image. The effect is cumulative so the more you paint over an area, the more pronounced the blur effect will be. The blur is only applied to pixels on the currently selected layer.
The following settings can be adjusted using vertical tool sliders:
Opacity/Accumulation toggle—how see-through the brush is or the extent of deviation in the opacity or visibility of the stroke as it is painted, respectively. Tap to toggle the setting, then slide up or down to set the value.
Flow/Hardness toggle—how fast the brush effect is applied (1% is very slow, 100% is immediate) or how hard edged the brush is, respectively.
Width—controls the width of the stroke using a vertical slider next to the tool's location. Slide up or down to set the width.The following settings can be adjusted from the context toolbar:
Force Pressure—toggle to control brush size with pressure if using a pressure-sensitive device. This overrides brush defaults.