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;
; The GIMP -- an image manipulation program
; Copyright (C) 1995 Spencer Kimball and Peter Mattis
;
; Gothic Glow script  for GIMP 2.4
; Original author: Mark Lowry
;
; Tags: photo, gothic, glow
;
; Author statement:
;
; A GIMP script-fu version of the popular PS
; action by "feivel".
; Creates a layer set to multiply mode and
; another layer set to screen mode.
; Blur radii may be specified for each layer,
; and you can choose to add fully transparent
; layer masks to both layers automatically.
;
; --------------------------------------------------------------------
; Distributed by Gimp FX Foundry project
; --------------------------------------------------------------------
;   - Changelog -
; Created on 3/21/2006 for 2.2.8
; Revised 10/27/2007 to fix unbound variables (required for v.2.4.0).  Only tested on v.2.4.0
;
; --------------------------------------------------------------------
;
; This program is free software; you can redistribute it and/or modify
; it under the terms of the GNU General Public License as published by
; the Free Software Foundation; either version 2 of the License, or
; (at your option) any later version.
;
; This program is distributed in the hope that it will be useful,
; but WITHOUT ANY WARRANTY; without even the implied warranty of
; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
; GNU General Public License for more details.
;
; You should have received a copy of the GNU General Public License
; along with this program; if not, write to the Free Software
; Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;



(define (script-fu-gothic-glow  img drawable mult-blur-rad screen-blur-rad mask-flag )

   (let* (
       (mult-layer 0)
       (screen-layer 0)
         )

   ; Start an undo group.  Everything between the start and the end
   ; will be carried out if an undo command is issued.

   (gimp-image-undo-group-start img)

   ;; CREATE THE MULTIPLY LAYER ;;

   ; Create a new layer

   (set! mult-layer (car (gimp-layer-copy drawable 0)))

   ; Give it a name

   (gimp-drawable-set-name mult-layer _"Multiply Layer")

   ; Add the new layer to the image

   (gimp-image-add-layer img mult-layer 0)

   ; Set opacity to 100%

   (gimp-layer-set-opacity mult-layer 100)

   ; Copy the layer for later ...

   (set! screen-layer (car (gimp-layer-copy mult-layer 0)))

   ; Set the layer mode to Multiply

   (gimp-layer-set-mode mult-layer 3)

   ; Blur the layer

     (if (> mult-blur-rad 0)
       (plug-in-gauss-iir 1 img mult-layer mult-blur-rad 1 1 )
       ()
     )

   ; Add layer mask if required

     (if (equal? mask-flag TRUE)
       (gimp-layer-add-mask  mult-layer (car (gimp-layer-create-mask mult-layer 0)))
       ()
     )

   ;
   ;

   ;; CREATE THE SCREEN LAYER ;;

   ; Name the screen layer

   (gimp-drawable-set-name screen-layer _"Screen Layer")

   ; Add the new layer to the image

   (gimp-image-add-layer img screen-layer 0)

   ; Set opacity to 100%

   (gimp-layer-set-opacity screen-layer 100)

   ; Set the layer mode to Screen

   (gimp-layer-set-mode screen-layer 4)

   ; Blur the layer

     (if (> screen-blur-rad 0)
       (plug-in-gauss-iir 1 img screen-layer screen-blur-rad 1 1 )
       ()
     )

   ; Add layer mask if required

     (if (equal? mask-flag TRUE)
       (gimp-layer-add-mask  screen-layer (car (gimp-layer-create-mask screen-layer 0)))
       ()
     )


   ; Complete the undo group

   (gimp-image-undo-group-end img)

   ; Flush the display

   (gimp-displays-flush)

   )

)


(script-fu-register "script-fu-gothic-glow"
      _"Gothic Glow"
      _"Add blurred multiply layer and a blurred screen layer with optional masks. Good for adding a surreal effect to images, especially landscapes."
      "Mark Lowry"
      "Mark Lowry"
      "2007"
      "RGB*, GRAY*"
      SF-IMAGE "Image" 0
      SF-DRAWABLE "Current Layer" 0
      SF-VALUE _"Multiply Layer Blur Radius"  "8"
      SF-VALUE _"Screen Layer Blur Radius"  "0"
      SF-TOGGLE _"Add Layer Masks?"  TRUE
 )

(script-fu-menu-register "script-fu-gothic-glow"
                         "<Image>/FX-Foundry/Light and Shadow")