brush’s diameter, as well as Shift + [ and Shift + ] to decrease and increase
the brush’s hardness. However, CS4 introduced an even more intuitive way
to do this. By holding Control + Option and dragging on the canvas, you
can change the brush’s diameter with a visual aid. Control + Command +
Option and dragging gives you control of the brush’s hardness.
The on-canvas drag makes brush adjustments more intuitive.
If you would like to completely change the brush shape to a different
preset, press < or > to cycle through them and Shift + < or Shift + > to
select the first or last brush. Right-clicking inside the canvas also displays a
condensed menu of brushes.