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GIMP Script-Fu Script | 2000-12-27 | 6.9 KB | 221 lines |
- ; NEON
- ; Create a text effect that simulates neon lighting
-
- (define (set-pt a index x y)
- (prog1
- (aset a (* index 2) x)
- (aset a (+ (* index 2) 1) y)))
-
- (define (neon-spline1)
- (let* ((a (cons-array 6 'byte)))
- (set-pt a 0 0 0)
- (set-pt a 1 127 145)
- (set-pt a 2 255 255)
- a))
-
- (define (neon-spline2)
- (let* ((a (cons-array 6 'byte)))
- (set-pt a 0 0 0)
- (set-pt a 1 110 150)
- (set-pt a 2 255 255)
- a))
-
- (define (neon-spline3)
- (let* ((a (cons-array 6 'byte)))
- (set-pt a 0 0 0)
- (set-pt a 1 100 185)
- (set-pt a 2 255 255)
- a))
-
- (define (neon-spline4)
- (let* ((a (cons-array 8 'byte)))
- (set-pt a 0 0 0)
- (set-pt a 1 64 64)
- (set-pt a 2 127 192)
- (set-pt a 3 255 255)
- a))
-
- (define (find-hue-offset color)
- (let* ((R (car color))
- (G (cadr color))
- (B (caddr color))
- (max-val (max R G B))
- (min-val (min R G B))
- (delta (- max-val min-val))
- (hue 0))
- (if (= max 0) 0
- (begin
- (cond ((= max-val R) (set! hue (/ (- G B) (* 1.0 delta))))
- ((= max-val G) (set! hue (+ 2 (/ (- B R) (* 1.0 delta)))))
- ((= max-val B) (set! hue (+ 4 (/ (- R G) (* 1.0 delta))))))
- (set! hue (* hue 60))
- (if (< hue 0) (set! hue (+ hue 360)))
- (if (> hue 360) (set! hue (- hue 360)))
- (if (> hue 180) (set! hue (- hue 360)))
- hue))))
-
- (define (apply-neon-logo-effect img
- tube-layer
- size
- bg-color
- glow-color
- shadow)
- (let* ((tube-hue (find-hue-offset glow-color))
- (shrink (/ size 14))
- (grow (/ size 40))
- (feather (/ size 5))
- (feather1 (/ size 25))
- (feather2 (/ size 12))
- (inc-shrink (/ size 100))
- (shadow-shrink (/ size 40))
- (shadow-feather (/ size 20))
- (shadow-offx (/ size 10))
- (shadow-offy (/ size 10))
- (width (car (gimp-drawable-width tube-layer)))
- (height (car (gimp-drawable-height tube-layer)))
- (glow-layer (car (gimp-layer-new img width height RGBA_IMAGE "Neon Glow" 100 NORMAL)))
- (bg-layer (car (gimp-layer-new img width height RGB_IMAGE "Background" 100 NORMAL)))
- (shadow-layer (if (= shadow TRUE)
- (car (gimp-layer-new img width height RGBA_IMAGE "Shadow" 100 NORMAL))
- 0))
- (selection 0)
- (old-fg (car (gimp-palette-get-foreground)))
- (old-bg (car (gimp-palette-get-background))))
- (gimp-image-resize img width height 0 0)
- (gimp-image-add-layer img bg-layer 1)
- (if (not (= shadow 0))
- (begin
- (gimp-image-add-layer img shadow-layer 1)
- (gimp-edit-clear shadow-layer)))
- (gimp-image-add-layer img glow-layer 1)
-
- (gimp-palette-set-background '(0 0 0))
- (gimp-selection-layer-alpha tube-layer)
- (set! selection (car (gimp-selection-save img)))
- (gimp-selection-none img)
-
- (gimp-edit-clear glow-layer)
- (gimp-edit-clear tube-layer)
-
- (gimp-palette-set-background bg-color)
- (gimp-edit-fill bg-layer BG-IMAGE-FILL)
-
- (gimp-selection-load selection)
- (gimp-palette-set-background '(255 255 255))
- (gimp-edit-fill tube-layer BG-IMAGE-FILL)
- (gimp-selection-shrink img shrink)
- (gimp-palette-set-background '(0 0 0))
- (gimp-edit-fill selection BG-IMAGE-FILL)
- (gimp-edit-clear tube-layer)
-
- (gimp-selection-none img)
- (if (not (= feather1 0)) (plug-in-gauss-rle 1 img tube-layer feather1 TRUE TRUE))
- (gimp-selection-load selection)
- (if (not (= feather2 0)) (plug-in-gauss-rle 1 img tube-layer feather2 TRUE TRUE))
-
- (gimp-selection-feather img inc-shrink)
- (gimp-selection-shrink img inc-shrink)
- (gimp-curves-spline tube-layer 4 6 (neon-spline1))
-
- (gimp-selection-load selection)
- (gimp-selection-feather img inc-shrink)
- (gimp-selection-shrink img (* inc-shrink 2))
- (gimp-curves-spline tube-layer 4 6 (neon-spline2))
-
- (gimp-selection-load selection)
- (gimp-selection-feather img inc-shrink)
- (gimp-selection-shrink img (* inc-shrink 3))
- (gimp-curves-spline tube-layer 4 6 (neon-spline3))
-
- (gimp-layer-set-preserve-trans tube-layer 1)
- (gimp-selection-layer-alpha tube-layer)
- (gimp-selection-invert img)
- (gimp-palette-set-background glow-color)
- (gimp-edit-fill tube-layer BG-IMAGE-FILL)
-
- (gimp-selection-none img)
- (gimp-layer-set-preserve-trans tube-layer 0)
- (gimp-curves-spline tube-layer 4 8 (neon-spline4))
-
- (gimp-selection-load selection)
- (gimp-selection-grow img grow)
- (gimp-selection-invert img)
- (gimp-edit-clear tube-layer)
- (gimp-selection-invert img)
-
- (gimp-selection-feather img feather)
- (gimp-edit-fill glow-layer BG-IMAGE-FILL)
-
- (if (not (= shadow 0))
- (begin
- (gimp-selection-load selection)
- (gimp-selection-grow img grow)
- (gimp-selection-shrink img shadow-shrink)
- (gimp-selection-feather img shadow-feather)
- (gimp-selection-translate img shadow-offx shadow-offy)
- (gimp-palette-set-background '(0 0 0))
- (gimp-edit-fill shadow-layer BG-IMAGE-FILL)))
- (gimp-selection-none img)
-
- (gimp-layer-set-name tube-layer "Neon Tubes")
- (gimp-palette-set-background old-bg)
- (gimp-palette-set-foreground old-fg)
- (gimp-image-remove-channel img selection)))
-
- (define (script-fu-neon-logo-alpha img
- tube-layer
- size
- bg-color
- glow-color
- shadow)
- (begin
- (gimp-undo-push-group-start img)
- (apply-neon-logo-effect img tube-layer size bg-color glow-color shadow)
- (gimp-undo-push-group-end img)
- (gimp-displays-flush)))
-
- (script-fu-register "script-fu-neon-logo-alpha"
- _"<Image>/Script-Fu/Alpha to Logo/Neon..."
- "Neon logos"
- "Spencer Kimball"
- "Spencer Kimball"
- "1997"
- "RGBA"
- SF-IMAGE "Image" 0
- SF-DRAWABLE "Drawable" 0
- SF-ADJUSTMENT _"Effect Size (pixels * 5)" '(150 2 1000 1 10 0 1)
- SF-COLOR _"Background Color" '(0 0 0)
- SF-COLOR _"Glow Color" '(38 211 255)
- SF-TOGGLE _"Create Shadow" FALSE
- )
-
- (define (script-fu-neon-logo text
- size
- font
- bg-color
- glow-color
- shadow)
- (let* ((img (car (gimp-image-new 256 256 RGB)))
- (border (/ size 4))
- (tube-layer (car (gimp-text-fontname img -1 0 0 text border TRUE size PIXELS font))))
- (gimp-image-undo-disable img)
- (gimp-layer-set-name tube-layer text)
- (apply-neon-logo-effect img tube-layer size bg-color glow-color shadow)
- (gimp-image-undo-enable img)
- (gimp-display-new img)))
-
- (script-fu-register "script-fu-neon-logo"
- _"<Toolbox>/Xtns/Script-Fu/Logos/Neon..."
- "Neon logos"
- "Spencer Kimball"
- "Spencer Kimball"
- "1997"
- ""
- SF-STRING _"Text" "NEON"
- SF-ADJUSTMENT _"Font Size (pixels)" '(150 2 1000 1 10 0 1)
- SF-FONT _"Font" "-*-Blippo-*-*-*-*-24-*-*-*-*-*-*-*"
- SF-COLOR _"Background Color" '(0 0 0)
- SF-COLOR _"Glow Color" '(38 211 255)
- SF-TOGGLE _"Create Shadow" FALSE
- )
-