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+; przem-apply-sepia-v3 - Script-fu dodający prawdziwą sepie do zdjęcia
+; author: PRP
+; licencja: Public Domain
+; Gdańsk - 07-02-2025
+; ver. 1.2502010-4 for GIMP 3
+
+(define (przem-apply-sepia-v3 image drawable value-slider-sepia gradient-reverse gradient-shape)
+  
+  (let* (
+       (image-width (car (gimp-image-get-width image)))
+       (image-height (car (gimp-image-get-height image)))
+       (center-x (/ image-width 2))
+       (center-y (* image-height 0.5)) ; either is OK
+       (sepia-layer (car (gimp-layer-new image image-width image-height RGBA-IMAGE "Sepia Layer" 100 LAYER-MODE-NORMAL)))
+       (is-nocolorful (car (gimp-drawable-is-gray drawable))) ; czy obraz jest w odcieniach szarości
+       )
+  
+  (gimp-image-undo-group-start image)
+  ;(gimp-image-undo-disable image)
+
+
+
+  ; jeśli obraz jest szary to konwertuje go na RGB - tak na sztukę
+  (if (= is-nocolorful TRUE)
+    (gimp-image-convert-rgb image)
+  )
+  
+  ; Konwersja obrazu do skali szarości
+  ;(gimp-desaturate drawable)
+  (gimp-drawable-desaturate drawable DESATURATE-LIGHTNESS)
+  
+  ; Dodanie koloru sepii
+  ;(gimp-context-set-foreground '(112 66 20)) ; Kolor sepii
+  
+  (gimp-image-insert-layer image sepia-layer 0 -1)
+ 
+
+  (gimp-context-push)
+  (gimp-context-set-foreground (list 112 66 20)) ; ciemniejsza
+  (gimp-context-set-background (list 210 180 140)) ; jasniejsza
+  ;(plug-in-checkerboard #:run-mode    RUN-NONINTERACTIVE
+  ;                        #:image       image
+  ;                        #:drawables   (vector drawable)
+  ;                        #:psychobilly 0
+  ;                        #:check-size  8)
+  (plug-in-checkerboard RUN-NONINTERACTIVE image (vector sepia-layer) 0 8)
+  
+  (gimp-context-pop)
+
+  (gimp-context-push)
+
+  (gimp-selection-all image)
+  ; tak było w v. 2.10
+  ;(gimp-edit-blend sepia-layer FG-BG-RGB-MODE NORMAL-MODE GRADIENT-LINEAR 100 0 REPEAT-NONE FALSE TRUE 3 0 TRUE 0 0 image-width image-height)
+  (if (= gradient-shape TRUE)
+    (begin
+      (gimp-context-set-gradient-reverse gradient-reverse)
+      (gimp-drawable-edit-gradient-fill sepia-layer
+				      GRADIENT-LINEAR 0
+				      FALSE 1 0
+				      TRUE
+				      0 0 image-width image-height)
+	)
+	(begin
+      (gimp-context-set-gradient-reverse gradient-reverse)
+      (gimp-drawable-edit-gradient-fill sepia-layer
+				      GRADIENT-SHAPEBURST-DIMPLED  0
+				      FALSE 1 0
+				      TRUE
+				      0 0 image-width image-height)
+	) )
+	
+  (gimp-context-pop)
+
+
+  ; Zmiana krycia warstwy
+  (gimp-layer-set-opacity sepia-layer value-slider-sepia)
+  
+  (gimp-image-merge-down image sepia-layer CLIP-TO-IMAGE)
+  
+  (gimp-image-undo-group-end image)
+  ;(gimp-image-undo-enable image)
+  
+  (gimp-displays-flush)
+) )
+
+(script-fu-register "przem-apply-sepia-v3"
+  _"Apply a sepia effect to the image"
+  _"Tworzy obraz sepii"
+  "Przemyslaw R. Pietraszczyk"
+  "Public Domain"
+  "2025-02-07"
+  "RGB* GRAY*"
+  SF-IMAGE "Image" 0
+  SF-DRAWABLE "Drawable" 0
+  SF-ADJUSTMENT "Sepia intensity" '(50 0 100 1 10 0 0)  ; Suwak poziomy
+  SF-TOGGLE     "Gradient reverse" FALSE
+  SF-TOGGLE     "Shape" TRUE
+
+
+) 
+ 
+(script-fu-menu-register "przem-apply-sepia-v3"
+                         "<Image>/Filters/PIETRASZCZYK/")