4 For Document, do one of the following:
• Choose a destination. Only open images with pixel dimensions identical to the current image are available. To duplicate the channel in the same file, select the channel's current file.
• Choose New to copy the channel to a new image, creating a multichannel image containing a single channel. Type a name for the new image.
5 To reverse the selected and masked areas in the duplicate channel, select Invert.
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