GIMP Script/Plugin Example

(define (fbk-effect image drawable)
  (let* (
         (img-height (car (gimp-image-height image)))
         (img-width (car (gimp-image-width image)))
         (new-layer)
         )
    (gimp-image-undo-group-start image)
    ;(gimp-convert-grayscale image)
    (gimp-desaturate drawable)
    (plug-in-neon 0 image drawable 5 5)

    (set! new-layer (car (gimp-layer-new image img-width img-height RGBA-IMAGE "layer" 100 LAYER-MODE-HARDLIGHT)))
    (gimp-image-insert-layer image new-layer 0 0)
    (gimp-selection-flood image)
    (gimp-drawable-edit-fill new-layer FILL-FOREGROUND)

    (gimp-displays-flush)
    (gimp-image-undo-group-end image)
    )
  )

(script-fu-register
  "fbk-effect"                        ;function name
  "Test Effect with Layers"                                  ;menu label
  "Add some effects and layers."              ;description
  "Kris Occhipinti"                             ;author
  "Copyright 2023,Kris Occhipinti;\
  GPLv3"        ;copyright notice
  "March 25, 2023"                          ;date created
  ""                                      ;image type that the script works on
  SF-IMAGE "Image" 0
  SF-DRAWABLE "Drawable" 0
  )
(script-fu-menu-register "fbk-effect" "<Image>/FBK")