; "Remove Paper Texture" is a script for The GIMP
;
; Removes paper texture from scanned images (using the fill tool)
; Should work on coloured images
;
; The script is located in menu "<Image> / Filters / Enhance"
; Last changed: 1 September 2010
;
; 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 3 of the License, or
; (at your option) any later version.
(define (add-background-layer
theImage
layerName
fillType
)
(let (
;Get the number of layers
(numLayers (car (gimp-image-get-layers theImage)))
;Make a new layer
(bgLayer (car (gimp-layer-new theImage
1 1 RGB-IMAGE layerName 100 NORMAL-MODE )))
)
;Add to the image at the lowest postion
(gimp-image-add-layer theImage bgLayer numLayers )
;Resize to fit the image
(gimp-layer-resize-to-image-size bgLayer)
;Fill it with pure white
(gimp-drawable-fill bgLayer fillType)
)
)
(define (script-fu-remove-background-colour
theImage
theLayer
)
;Start an undo group so the process can be undone with one undo
(gimp-image-undo-group-start theImage)
; Create a new background layer and fill white
(add-background-layer theImage "Background" WHITE-FILL)
; add alpha channel to the image
(gimp-layer-add-alpha theLayer)
;Select everything
(gimp-selection-all theImage)
;Apply the color erasing fill
(gimp-edit-bucket-fill theLayer FG-BUCKET-FILL COLOR-ERASE-MODE 100 0 0 0 0)
;Desaturate
(gimp-desaturate theLayer)
;Apply an unsharp mask
;(plug-in-unsharp-mask TRUE theImage theLayer 5 0.25 0)
;Merge layers
(gimp-image-merge-visible-layers theImage CLIP-TO-IMAGE)
(set! theLayer (car (gimp-image-get-active-layer theImage)))
(gimp-layer-set-name theLayer "Image")
;Finish the undo group for the process
(gimp-image-undo-group-end theImage)
;Ensure the updated image is displayed now
(gimp-displays-flush)
)
;Register the script w/ GIMP.
(script-fu-register
"script-fu-remove-background-colour" ;func name
"Remove background colour" ;menu label
"Removes a flat background colour from an image and desaturates";description
"Inductiveload" ;author
"GPL" ;copyright notice
"Aug. 2010" ;date created
"" ;image type that the script works on
SF-IMAGE "Image" 0
SF-DRAWABLE "Layer to convert" 0
)
(script-fu-menu-register "script-fu-remove-background-colour"
"<Image>/Filters/Enhance")
