How can you create custom brushes in Photoshop?

To create custom brushes in Photoshop, selecting an image and then navigating to Edit > Define Brush Preset is the most direct and effective method. This process allows you to convert any selected area or image into a brush, providing a unique and personalized tool that captures your desired details and characteristics. After this step, you can name your new brush, making it easy to find and use later.

The other options, while related to brushes in some way, do not specifically address the creation of new custom brushes. Modifying an existing brush does allow for customization, but it does not result in the creation of a new brush from scratch. Downloading brushes from the Adobe website provides additional options, but it does not pertain to creating a unique brush from your own images. Opening the Brush panel and selecting a brush shape provides a starting point for using brushes, but does not equate to the creation of a custom brush. Therefore, option A stands out as the correct method for crafting custom brushes in Photoshop.