On the whole it's probably better to use the existing layer, because that
way you automatically
keep its properties such as transparency, mode, etc.  If you create a new
layer, you will have to
set all those things by hand.  In terms of computational load it probably
doesn't make much
difference -- you have to transport all the pixel data from Gimp to plug-in
and back no matter which
way you do it.

  -- Bill
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