Quoting Klaus Schmidinger <[EMAIL PROTECTED]>:

"GIMP: Not enough visible layers for a merge. There must be at least two."

The CVS version of the GIMP permits "merging" a single layer. If you are unable to get the CVS version, you can try the following approach which applies a 50% (GRAY) mask to the layer.

-------
(let* (
    (image (car (gimp-file-load 1 "test.png" "test.png")))
    (drawable (car (gimp-image-get-active-layer image)))
    (mask (car (gimp-layer-create-mask drawable ADD-WHITE-MASK))))
  (gimp-layer-add-mask drawable mask)
  (gimp-brightness-contrast mask -127 0)
  (gimp-image-remove-layer-mask image drawable MASK-APPLY)

(gimp-file-save RUN-NONINTERACTIVE image drawable "test-50.png" "test-50.png")
  (gimp-quit 0)
  )
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