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; Create Luminosity Masks for an image
; Originally authored by Patrick David <>
; re-coded by Saul Goode to honor selection and layer offsets
; Will isolate light, mid, and dark tones in an image as channel masks
; Adapted from tutorial by Tony Kuyper (originally for PS)
; 2016-02-22 - Pat David
; Adapted for GIMP 2.9.x by updating some deprecated pdb calls to
; their new versions.
; 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
; GNU General Public License for more details.
(define (script-fu-sg-luminosity-masks image drawable)
(gimp-image-undo-group-start image)
(let ((orig-sel (car (gimp-selection-save image)))
(L (car (gimp-selection-save image)))
(LL #f)
(LLL #f)
(D #f)
(DD #f)
(DDD #f)
(M #f)
(MM #f)
(MMM #f)
(masks '())
(name (car (gimp-item-get-name drawable))) )
(set! masks (cons L masks))
(gimp-item-set-name L (string-append "L-" name))
(gimp-selection-none image)
; paste uses luminosity desaturation method
(let ((buffer (car (gimp-edit-named-copy drawable "temp"))))
(gimp-floating-sel-anchor (car (gimp-edit-named-paste L buffer TRUE)))
(gimp-buffer-delete buffer) )
(set! D (car (gimp-channel-copy L)))
(gimp-image-insert-channel image D 0 1)
(gimp-item-set-name D (string-append "D-" name))
(gimp-invert D)
(set! masks (cons D masks))
(set! DD (car (gimp-channel-copy D)))
(gimp-image-insert-channel image DD 0 2)
(gimp-item-set-name DD (string-append "DD-" name))
(gimp-channel-combine-masks DD L CHANNEL-OP-SUBTRACT 0 0)
(set! masks (cons DD masks))
(set! DDD (car (gimp-channel-copy DD)))
(gimp-image-insert-channel image DDD 0 3)
(gimp-item-set-name DDD (string-append "DDD-" name))
(gimp-channel-combine-masks DDD L CHANNEL-OP-SUBTRACT 0 0)
(set! masks (cons DDD masks))
(set! LL (car (gimp-channel-copy L)))
(gimp-image-insert-channel image LL 0 1)
(gimp-item-set-name LL (string-append "LL-" name))
(gimp-channel-combine-masks LL D CHANNEL-OP-SUBTRACT 0 0)
(set! masks (cons LL masks))
(set! LLL (car (gimp-channel-copy LL)))
(gimp-image-insert-channel image LLL 0 2)
(gimp-item-set-name LLL (string-append "LLL-" name))
(gimp-channel-combine-masks LLL D CHANNEL-OP-SUBTRACT 0 0)
(set! masks (cons LLL masks))
(set! M (car (gimp-channel-copy L)))
(gimp-image-insert-channel image M 0 3)
(gimp-item-set-name M (string-append "M-" name))
(gimp-channel-combine-masks M D CHANNEL-OP-INTERSECT 0 0)
(set! masks (cons M masks))
(set! MM (car (gimp-channel-copy LL)))
(gimp-image-insert-channel image MM 0 3)
(gimp-item-set-name MM (string-append "MM-" name))
(gimp-invert MM)
(gimp-channel-combine-masks MM DD CHANNEL-OP-SUBTRACT 0 0)
(set! masks (cons MM masks))
(set! MMM (car (gimp-channel-copy LLL)))
(gimp-image-insert-channel image MMM 0 3)
(gimp-invert MMM)
(gimp-item-set-name MMM (string-append "MMM-" name))
(gimp-channel-combine-masks MMM DDD CHANNEL-OP-SUBTRACT 0 0)
(set! masks (cons MMM masks))
;(gimp-selection-load orig-sel)
(gimp-image-select-item image CHANNEL-OP-REPLACE orig-sel)
(if (or (= (car (gimp-selection-is-empty image)) TRUE)
(= (car (gimp-drawable-mask-intersect drawable)) FALSE) )
(gimp-selection-all image) )
;(gimp-rect-select image
; (car (gimp-drawable-offsets drawable))
; (cadr (gimp-drawable-offsets drawable))
; (car (gimp-drawable-width drawable))
; (car (gimp-drawable-height drawable))
(gimp-image-select-rectangle image
(car (gimp-drawable-offsets drawable))
(cadr (gimp-drawable-offsets drawable))
(car (gimp-drawable-width drawable))
(car (gimp-drawable-height drawable)) )
(gimp-selection-invert image)
(unless (= (car (gimp-selection-is-empty image)) TRUE)
(map (lambda (x) (gimp-edit-fill x WHITE-FILL)
(gimp-invert x) )
masks ))
;(gimp-selection-load orig-sel)
(gimp-image-select-item image CHANNEL-OP-REPLACE orig-sel)
(gimp-image-remove-channel image orig-sel)
(gimp-image-set-active-layer image drawable)
(gimp-image-undo-group-end image)
(script-fu-register "script-fu-sg-luminosity-masks"
"Luminosity Masks (saulgoode)"
"Create Luminosity Masks of Layer"
"saul goode"
"saul goode"
"Nov 2013"
SF-IMAGE "Image" 0
SF-DRAWABLE "Drawable" 0
(script-fu-menu-register "script-fu-sg-luminosity-masks" "<Image>/Filters/Generic")