From 83a9d49cf0a64af29aaa58df04497eeeda75553b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Przemys=C5=82aw=20R=2E=20Pietraszczyk?=
 <przem@prymula.ct8.pl>
Date: Mon, 1 Sep 2025 20:20:45 +0200
Subject: 2.250901-0:przem-sunset-effect-v3.scm

---
 script-fu/3.0/przem-sunset-effect-v3.scm | 103 +++++++++++++++++++++++++++++++
 script-fu/changelog.md                   |   5 +-
 2 files changed, 107 insertions(+), 1 deletion(-)
 create mode 100644 script-fu/3.0/przem-sunset-effect-v3.scm

diff --git a/script-fu/3.0/przem-sunset-effect-v3.scm b/script-fu/3.0/przem-sunset-effect-v3.scm
new file mode 100644
index 0000000..0dbc201
--- /dev/null
+++ b/script-fu/3.0/przem-sunset-effect-v3.scm
@@ -0,0 +1,103 @@
+; przem-sunset-effect-v3 - imituje efekt zachodzącego słońca
+; author: PRP
+; licencja: Public Domain
+; Gdańsk - 01-09-2025
+; ver. 2.250901-0~beta
+
+(define (shadows val)
+     (/ (* 0.96 val) 2.55))
+
+(define (midtones val)
+     (/ val 2.55))
+
+(define (highlights val)
+     ; The result is used as "gimp-drawable-color-balance" color parameter
+     ; and thus must be restricted to -100.0 <= highlights <= 100.0.
+     (min (/ (* 1.108 val) 2.55) 100.0))
+
+(define (rval col)
+     (car col))
+
+(define (gval col)
+     (cadr col))
+
+(define (bval col)
+     (caddr col))
+
+
+(define (przem-sunset-effect-v3 img drawable)
+  (gimp-image-undo-group-start img)
+  
+  ; Tworzenie warstw dla różnych efektów
+  (let* (
+		(layer (vector-ref drawable 0))
+        (sunset-layer (car (gimp-layer-copy layer TRUE)))
+        ;(original-visible (car (gimp-drawable-get-visible drawable)))
+        (original-visible (car (gimp-layer-copy layer TRUE)))
+		(width (car (gimp-image-get-width img)))
+        (height (car (gimp-image-get-height img)))
+        )
+    
+    ; Dodawanie warstwy do obrazu
+    (gimp-image-insert-layer img sunset-layer 0 -1)
+    (gimp-layer-set-mode sunset-layer LAYER-MODE-MULTIPLY)
+    (gimp-item-set-name sunset-layer _"Sunset Effect")
+
+    
+    ; Nakładanie gradientu ciepłych kolorów
+    (gimp-context-set-foreground '(255 100 0))   ; pomarańczowy
+    (gimp-context-set-background '(150 0 50))    ; różowo-czerwony
+    
+    ; Tworzenie gradientu
+    (gimp-layer-set-mode sunset-layer LAYER-MODE-SUBTRACT) ; 
+	(gimp-drawable-edit-gradient-fill sunset-layer
+		GRADIENT-LINEAR 1 FALSE 1 0 TRUE
+		0 0 width height)
+
+   
+	; cieplejsze cienie
+    (gimp-drawable-color-balance sunset-layer TRANSFER-SHADOWS 1
+                                  (shadows (rval '(30 0 -20)))
+                                  (shadows (gval '(30 0 -20)))
+                                  (shadows (bval '(30 0 -20))))
+                                  
+   ; cieplejsze średnie tony
+    (gimp-drawable-color-balance sunset-layer TRANSFER-MIDTONES 1
+                                  (midtones (rval '(40 0 -10)))
+                                  (midtones (gval '(40 0 -10)))
+                                  (midtones (bval '(40 0 -10))))
+                                  
+    ; cieplejsze światła
+    (gimp-drawable-color-balance sunset-layer TRANSFER-HIGHLIGHTS 1
+                                  (highlights (rval '(20 0 -5)))
+                                  (highlights (gval '(20 0 -5)))
+                                  (highlights (bval '(20 0 -5))))
+
+    
+    ; Zwiększenie kontrastu
+    ;(gimp-levels sunset-layer 0 20 230 1.0 0 255)
+    (gimp-drawable-levels sunset-layer 0
+                           0 0.20 0 TRUE
+                           1.0
+                           0.0 1.0 TRUE)
+
+    ; Dodanie lekkiego rozmycia dla miękkiego efektu
+    ;(plug-in-gauss-iir 1 img sunset-layer 5 TRUE TRUE)
+    (gimp-drawable-merge-new-filter sunset-layer "gegl:gaussian-blur" 1 LAYER-MODE-REPLACE 1.0 "std-dev-x" 5 "std-dev-y" 5 "filter" "auto")
+
+    (gimp-image-undo-group-end img)
+    (gimp-displays-flush)
+  )
+)
+
+(script-fu-register-filter "przem-sunset-effect-v3"
+                    _"Sunset Effect"
+                    _"Imitacja kolorystyki zachodu słońca"
+                    "P.R.P."
+                    "Public Domain"
+                    "2025-09-01"
+                    "*"
+                    SF-ONE-OR-MORE-DRAWABLE)
+
+(script-fu-menu-register "przem-sunset-effect-v3"
+                         "<Image>/Filters/PIETRASZCZYK/")
diff --git a/script-fu/changelog.md b/script-fu/changelog.md
index f4a6374..2465dcf 100644
--- a/script-fu/changelog.md
+++ b/script-fu/changelog.md
@@ -1,7 +1,10 @@
+# [2.250901-0] przem-sunset-effect-v3.scm
+* Nowy filtr z imitacją zachodu słońca
+
 # [2.250824-2] przem-cyanotype-color-effect-multi-v3.scm
 * Uproszczona konwersja (bez gumy) przem-cyanotype-gum-effect.scm
 
-# [2.250824-1]
+# [2.250824-1] przem-wet-collodion-v3
 * dodanie opcji MODE dla rozmycia z trybami: AUTO, IIR, FIR
 
 # [2.250824-0] przem-wet-collodion-v3
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