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# Inverting masks

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Ordinarily, a mask constrains its tool's effect to be inside all of its regions. Occasionally, it's useful to be able to use a mask to specify an area of your photo to exclude from a tool's effect. You can invert a mask to do this.

## To invert a mask for a tool:

1. Select the tool whose mask you want to invert by clicking its title bar.
2. Make sure the Tool Settings tab is selected.
3. Click the tool's invert-mask box.