REALpicture and memory management

[Phil M <phil at mobleybros dot com>]

I have a function in my plugin which accepts a REALpicture, does  
something with it and then creates a new REALpicture to return.   
Function prototype looks like this:
    static REALpicture InvertRGB(REALpicture thePict);

Do I need to free/unlock either the function parameter or the return  
value?  Or is unlocking only required for a matching Lock request?

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