If you set it to 0 %, the brush will only be opaque in its center, and will gradually become transparent towards its edges. If you set it to 100 %, the brush will be completely solid.
Use the Hardness slider to set how much of the outer part of your brush tip should fade to transparency.If you want your brush tip to be at an angle, use the Angle slider to rotate your brush tip.If you want your brush tip to have uneven dimensions, use the Roundness slider to shrink the brush tip vertically all the while preserving its horizontal size.If you don't want the pressure on your pen to affect the brush size, set this parameter to 100%.
The minimum size is set to a percentage of your brush tip's maximum size, which is 25% by default. If you are using a pressure-sensitive pen tablet, use the Minimum Size slider to set the size of your brush when using your pen with very little pressure.When drawing with a pressure-sensitive pen tablet, your brush's size will range between its minimum and maximum size, depending on the amount of pressure you put on the pen when drawing. NOTE: When drawing with a mouse, your brush is always at its maximum size.
