Rails - Sep 2007 - overlaying an image with file_column, rmagick

Anybody know the rmagic commands in the model definition to overlay a
24-bit png file over an uploaded jpg using file_column?

I have this:

file_column :post_photo, :magick => {
      :geometry => "648x800",
      :versions => { "small" => {:size => "60x60",
:crop => "1:1", :name
=> "small" } }
    }

But I want to do this:

file_column :post_photo, :magick => {
      :geometry => "648x800",
      :versions => { "small" => {:size => "60x60",
:crop => "1:1", :name
=> "small", ***composite my png image over this small version to
round
the corners***} }
    }


TIA
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Not yet. I kinda gave up on it as other priorities came to the fore. I 
did find another plug in that was supposed to be better than 
file_column, but it has a steeper-looking learning curve so I put it on 
the back burner for now. But once I get things cleared away I will 
probably go back to it. I forget the name of the plug-in, though I do 
remember reading that a lot of people were saying it worked much better 
than file_column and had more features.
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