Photoshop CS6 Tutorial
How to Create a Custom Dual Brush in Photoshop
Dual Brushes are unique in that they are created using two different round or custom brush shapes.
Open a new 1,024 pixel x 1,024 pixel document with a white background in Photoshop (File > New).
Click the Brush tool (b key), set a Foreground Color and open the Brush panel (Window > Brush).
Open the Brush Presets panel and reset the brushes by choosing Reset Brushes from the panel pull-down menu.
Choose a starting brush from the panel. For this example, we chose Grass.
Paint a line across the top of the document with your new brush.
In the Brush panel (Window > Brush) click Dual Brush. This is where we will choose the second brush shape.
Click another brush shape. Adjust the Size and Spacing sliders in the bottom of the panel to create your new brush. Watch the brush preview as you fine tune the brush.
You can select a Blending Mode from the pull-down menu at the top of the panel.
Paint with your new dual brush in the document.
To save and name your new brush, click the Create New Brush icon at the bottom of the panel.