### 2.2. Adding or subtracting selections

Tools have options that you can configure. Each selection tool allows you to set the selection mode. The following selection modes are supported:

- Replace is the most used selection mode. In replace mode, a selection replaces any existing selection.

- Add mode, causes new selections to be added to any existing selection. Press and hold the Shift key while making a selection to temporarily enter add mode.

- Subtract mode, causes new selections to be removed from any existing selection. Press and hold the Ctrl key while making a selection to temporarily enter subtract mode.

- Intersect mode, causes areas in both the new and existing selection to become the new selection. Press and hold both the Shift and Ctrl key while making a selection to temporarily enter intersect mode.

图 7.8. Enlarging a rectangular selection with Free Select

The figure shows an existing rectangular selection. Select Free Select. While pressing the Shift key, make a free hand selection that includes the existing selection. Release the mouse button and areas are included in the selection.

| 注意
To correct selection defects precisely, use the Quick Mask.

2. Creating and Using Selections |  | 3. The Quick Mask

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