The Auto Mask allows you to make highly complex selections with the brush, based on areas of similar color and brightness. It is highly effective over short single strokes. It is ideal when drawing masks of complex subjects, however, it can also be used for quick selections where boundaries are well-defined, such as a clear blue sky in a cityscape or where an object with contrasting color in front of a plain background has been used in a studio.
When masking complex areas prior to applying adjustments, it is recommended to work along the edges at high magnifications using a series of single short-strokes, moving around the perimeter until the selection is complete. You can then use either the Fill Mask option or continue to use a brush to complete the selection. Note that the Auto Mask option also works with the Eraser (E) where it is useful for editing masks made with the Brush tool.
- Select the Brush (B) icon in the Layers tool or from the Cursor toolbar.
- Right-click anywhere in the Viewer or click on the Brush Settings icon. The Brush Settings panel opens.
- Check-mark the Auto Mask option box to enable the feature.