Hi

In the Channels pannel I made a copy of the the Cyan channel by dragging this channel to the New channel botton at the bottom of the Channels panel.

My hope was to make this channel easier to select by applying a Levels adjustment, in order to load it as a mask selection later on. However it turns out the Levels command will not recognize the Cyan copy as this copy is not available for selection in the Channel menu. The only channels I can select from the Channels menu in the Levels dialog box are the original Cyan, Magneta, Yellow and Black. Can anybody tell me what I am doing wrong here?

Thank you for your time.