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Distress Selection
This script is under Selection -> Distort. 
Im interested in the steps.

As far as i can tell, it does the following:

- Spread
- Blur
- Levels (alpha)

But the code says Threshold instead of Levels, which is odd, because Threshold doesnt have an alpha option.

; distress selection
; Chris Gutteridge (
; At ECS Dept, University of Southampton, England.

; 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.
; This program is distributed in the hope that it will be useful,
; but WITHOUT ANY WARRANTY; without even the implied warranty of
; 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, see <>.

; Define the function:

(define (script-fu-distress-selection inImage

 (let (
      (theImage inImage)
      (theWidth (car (gimp-image-width inImage)))
      (theHeight (car (gimp-image-height inImage)))
      (theLayer 0)
      (theMode (car (gimp-image-base-type inImage)))
      (prevLayer (car (gimp-image-get-active-layer inImage)))

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

   (if (= theMode GRAY)
     (set! theMode GRAYA-IMAGE)
     (set! theMode RGBA-IMAGE)
   (set! theLayer (car (gimp-layer-new theImage
                                       "Distress Scratch Layer"

   (gimp-image-insert-layer theImage theLayer 0 0)

   (if (= FALSE (car (gimp-selection-is-empty theImage)))
       (gimp-edit-fill theLayer BACKGROUND-FILL)

   (gimp-selection-invert theImage)

   (if (= FALSE (car (gimp-selection-is-empty theImage)))
       (gimp-edit-clear theLayer)

   (gimp-selection-invert theImage)
   (gimp-selection-none inImage)

   (gimp-layer-scale theLayer
                     (/ theWidth inGranu)
                     (/ theHeight inGranu)

   (plug-in-spread RUN-NONINTERACTIVE

   (plug-in-gauss-iir RUN-NONINTERACTIVE
          theImage theLayer inSmooth inSmoothH inSmoothV)
   (gimp-layer-scale theLayer theWidth theHeight TRUE)
   (plug-in-threshold-alpha RUN-NONINTERACTIVE theImage theLayer inThreshold)
   (plug-in-gauss-iir RUN-NONINTERACTIVE theImage theLayer 1 TRUE TRUE)
   (gimp-image-select-item inImage CHANNEL-OP-REPLACE theLayer)
   (gimp-image-remove-layer theImage theLayer)
   (if (and (= (car (gimp-item-is-channel inDrawable)) TRUE)
            (= (car (gimp-item-is-layer-mask inDrawable)) FALSE))
     (gimp-image-set-active-channel theImage inDrawable)
   (gimp-image-undo-group-end theImage)

   (gimp-image-set-active-layer theImage prevLayer)


(script-fu-register "script-fu-distress-selection"
 _"Distress the selection"
 "Chris Gutteridge"
 "1998, Chris Gutteridge / ECS dept, University of Southampton, England."
 "23rd April 1998"
 SF-IMAGE       "The image"              0
 SF-DRAWABLE    "The layer"              0
 SF-ADJUSTMENT _"Threshold (bigger 1<-->254 smaller)" '(127 1 254 1 10 0 0)
 SF-ADJUSTMENT _"Spread"                 '(8 0 1000 1 10 0 1)
 SF-ADJUSTMENT _"Granularity (1 is low)" '(4 1 25 1 10 0 1)
 SF-ADJUSTMENT _"Smooth"                 '(2 1 150 1 10 0 1)
 SF-TOGGLE     _"Smooth horizontally"    TRUE
 SF-TOGGLE     _"Smooth vertically"      TRUE

(script-fu-menu-register "script-fu-distress-selection"
In the PDB:

Attached Files Thumbnail(s)
(06-23-2018, 06:49 PM)dinasset Wrote: In the PDB:

Allright, thanks !

I still need the steps to do it manually.
I still need an answer on the steps, please.

Anybody ?
As far as I can tell:
  • Add new transparent layer
  • Bucket-fill selection
  • Filters>Noise>Spread (give a width)
  • Blur (with radius somewhat smaller than width above, depending on smoothness)
  • Add layer mask, transfer alpha channel
  • Apply threshold on mask
  • Blur result for something a bit smoother
  • Apply mask
  • Alpha to selection
Thanks !
Liked using that one. It isn't working at all in my 2.10.2 Sad

Works fine for me (2.10.2 on Linux *and* Win7)
What is the effect (purpose) of this filter?
Is there an example of use?
(07-03-2018, 12:29 PM)dinasset Wrote: What is the effect (purpose) of this filter?
Is there an example of use?

It creates a randomly jagged selection (initial circle selection on left, result on right):


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