1 Open the two images you want to use.
Note: The images must have identical pixel dimensions. (See "Changing the pixel dimensions of an image" on page 67.)
2 Make the destination image active, and choose Select > Load Selection.
3 For Document, choose the source image.
4 For Channel, choose the channel containing the selection you want to use as a mask.
5 Click Invert if you want to make the nonselected areas selected and vice versa.
6 If the destination image already has a selection, indicate how to combine the selections. (For information on these options, see "Saving a mask selection" on page 281.)
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