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This script does LAB sharpening in GIMP using the unsharp mask.
;
; LAB Sharpen, v. 1.0
;
; Adam Kemp (gimp@adamkemp.com)
; (C) 2009
;
; This script does LAB sharpening in GIMP using the unsharp mask. The steps it automates are:
; 1. Decompose the image into LAB
; 2. Run the unsharp mask filter on the Luminance (L) layer using the supplied settings.
; 3. Recompose the image from the LAB image
;
; This script was tested with Gimp 2.6
;
; 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
; 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, see <http://www.gnu.org/licenses>.
;
; Define the function
;
(define (script-fu-AK-LABSharpen InImage InLayer InRadius InAmount InThreshold)
;
; Save history
;
(gimp-image-undo-group-start InImage)
(if (= (car (gimp-drawable-is-rgb InLayer)) FALSE ) (gimp-image-convert-rgb InImage))
;
(let*
(
; Decompose into LAB
(LABImage (car (plug-in-decompose TRUE InImage InLayer "LAB" TRUE)))
; Get the Luminance layer
(LuminanceLayer (aref (cadr (gimp-image-get-layers LABImage)) 0))
)
; Select the Luminance layer
(gimp-image-set-active-layer LABImage LuminanceLayer)
; Do the sharpen in the luminance layer
(plug-in-unsharp-mask TRUE LABImage LuminanceLayer InRadius InAmount InThreshold)
; Recompose
(plug-in-recompose TRUE LABImage LuminanceLayer)
; Delete the temporary LAB image
(gimp-image-delete LABImage)
)
;
; Finish work
;
(gimp-image-undo-group-end InImage)
(gimp-displays-flush)
;
)
;
(script-fu-register
"script-fu-AK-LABSharpen"
_"LAB Sharpen"
"Sharpen an image using the luminance channel"
"Adam Kemp (gimp@adamkemp.com)"
"Adam Kemp"
"2009/09/18"
"RGB*"
SF-IMAGE "The Image" 0
SF-DRAWABLE "The Layer" 0
SF-ADJUSTMENT "Radius" '(1 0.1 120.0 0.1 1.0 1 0)
SF-ADJUSTMENT "Amount" '(0.75 0.1 10.0 0.01 1.0 2 0)
SF-ADJUSTMENT "Threshold" '(0 0 255 1 5 0 0)
)
;
(script-fu-menu-register "script-fu-AK-LABSharpen"
"<Image>/Filters/AK")
;
@kinow
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kinow commented Dec 26, 2017

I liked the results! Thanks for sharing!!

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