1 Using any selection tool, select the part of the image you want to change.
2 Click the Quick Mask mode button in the toolbox.
A color overlay (similar to a rubylith) covers and protects the area outside the selection. The original selection is left unprotected by this mask. By default, Quick Mask mode colors the protected area using a red, 50% opaque overlay.
3 To edit the mask, select a painting or editing tool from the toolbox, or select a filter or adjustment command from the menu bar. By default, painting with black adds to the mask, shrinking the selection. Painting with white removes areas from the mask, expanding the selection. Painting with gray or another color creates a semitransparent area, useful for feathering or anti-aliased effects.
4 Click the Standard mode button_I in the toolbox to turn off the quick mask and return to your original image. A selection border now surrounds the unprotected area of the quick mask.
If a feathered mask is converted to a selection, the boundary line runs halfway between the black pixels and the white pixels of the mask gradient. The selection boundary indicates the pixels transition from being less than 50% selected to more than 50% selected.
5 Apply the desired changes to the image. Changes affect only the selected area.
6 Choose Select > Deselect to deselect the selection, or save the selection.
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