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chrome-it.scm
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2009-12-15
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; CHROME-IT
; State of the art chrome effect for user-specified mask
; This script requires a grayscale image containing a single layer.
; This layer is used as the mask for the SOTA chrome effect
(define (script-fu-sota-chrome-it mask-img mask-drawable chrome-saturation
chrome-lightness chrome-factor env-map hc cc carve-white)
(define (set-pt a index x y)
(begin
(aset a (* index 2) x)
(aset a (+ (* index 2) 1) y)
)
)
(define (spline-chrome-it)
(let* ((a (cons-array 18 'byte)))
(set-pt a 0 0 0)
(set-pt a 1 31 235)
(set-pt a 2 63 23)
(set-pt a 3 95 230)
(set-pt a 4 127 25)
(set-pt a 5 159 210)
(set-pt a 6 191 20)
(set-pt a 7 223 240)
(set-pt a 8 255 31)
a
)
)
(define (brush brush-size)
(cond ((<= brush-size 5) "Circle Fuzzy (05)")
((<= brush-size 7) "Circle Fuzzy (07)")
((<= brush-size 9) "Circle Fuzzy (09)")
((<= brush-size 11) "Circle Fuzzy (11)")
((<= brush-size 13) "Circle Fuzzy (13)")
((<= brush-size 15) "Circle Fuzzy (15)")
((<= brush-size 17) "Circle Fuzzy (17)")
(else "Circle Fuzzy (19)")
)
)
(define (shadows val)
(/ (* 0.96 val) 2.55)
)
(define (midtones val)
(/ val 2.55)
)
(define (highlights val)
(/ (* 1.108 val) 2.55)
)
(define (rval col)
(car col)
)
(define (gval col)
(cadr col)
)
(define (bval col)
(caddr col)
)
(define (sota-scale val scale chrome-factor)
(* (sqrt val) (* scale chrome-factor))
)
(define (copy-layer-chrome-it dest-image dest-drawable source-image source-drawable)
(gimp-selection-all dest-image)
(gimp-edit-clear dest-drawable)
(gimp-selection-none dest-image)
(gimp-selection-all source-image)
(gimp-edit-copy source-drawable)
(let (
(floating-sel (car (gimp-edit-paste dest-drawable FALSE)))
)
(gimp-floating-sel-anchor floating-sel)
)
)
(let* (
(banding-img (car (gimp-file-load 1 env-map env-map)))
(banding-layer (car (gimp-image-get-active-drawable banding-img)))
(banding-height (car (gimp-drawable-height banding-layer)))
(banding-width (car (gimp-drawable-width banding-layer)))
(banding-type (car (gimp-drawable-type banding-layer)))
(width (car (gimp-drawable-width mask-drawable)))
(height (car (gimp-drawable-height mask-drawable)))
(img (car (gimp-image-new width height GRAY)))
(size (min width height))
(offx1 (sota-scale size 0.33 chrome-factor))
(offy1 (sota-scale size 0.25 chrome-factor))
(offx2 (sota-scale size (- 0.33) chrome-factor))
(offy2 (sota-scale size (- 0.25) chrome-factor))
(feather (sota-scale size 0.5 chrome-factor))
(brush-size (sota-scale size 0.5 chrome-factor))
(mask (car (gimp-channel-new img width height "Chrome Stencil" 50 '(0 0 0))))
(bg-layer (car (gimp-layer-new img width height GRAY-IMAGE "Background" 100 NORMAL-MODE)))
(layer1 (car (gimp-layer-new img banding-width banding-height banding-type "Layer1" 100 NORMAL-MODE)))
(layer2 (car (gimp-layer-new img width height GRAYA-IMAGE "Layer 2" 100 DIFFERENCE-MODE)))
(layer3 (car (gimp-layer-new img width height GRAYA-IMAGE "Layer 3" 100 NORMAL-MODE)))
(shadow (car (gimp-layer-new img width height GRAYA-IMAGE "Drop Shadow" 100 NORMAL-MODE)))
(mask-fs 0)
(layer-mask 0)
)
(gimp-context-push)
(gimp-image-undo-disable img)
(gimp-image-add-channel img mask 0)
(gimp-image-add-layer img bg-layer 0)
(gimp-image-add-layer img shadow 0)
(gimp-image-add-layer img layer3 0)
(gimp-image-add-layer img layer2 0)
(gimp-edit-copy mask-drawable)
(set! mask-fs (car (gimp-edit-paste mask FALSE)))
(gimp-floating-sel-anchor mask-fs)
(if (= carve-white FALSE)
(gimp-invert mask)
)
(gimp-context-set-background '(255 255 255))
(gimp-selection-none img)
(gimp-edit-fill layer2 BACKGROUND-FILL)
(gimp-edit-fill layer3 BACKGROUND-FILL)
(gimp-edit-clear shadow)
(gimp-drawable-set-visible bg-layer FALSE)
(gimp-drawable-set-visible shadow FALSE)
(gimp-selection-load mask)
(gimp-context-set-background '(0 0 0))
(gimp-selection-translate img offx1 offy1)
(gimp-selection-feather img feather)
(gimp-edit-fill layer2 BACKGROUND-FILL)
(gimp-selection-translate img (* 2 offx2) (* 2 offy2))
(gimp-edit-fill layer3 BACKGROUND-FILL)
(gimp-selection-none img)
(set! layer2 (car (gimp-image-merge-visible-layers img CLIP-TO-IMAGE)))
(gimp-invert layer2)
(gimp-image-add-layer img layer1 0)
(copy-layer-chrome-it img layer1 banding-img banding-layer)
(gimp-image-delete banding-img)
(gimp-layer-scale layer1 width height FALSE)
(plug-in-gauss-iir RUN-NONINTERACTIVE img layer1 10 TRUE TRUE)
(gimp-layer-set-opacity layer1 50)
(set! layer1 (car (gimp-image-merge-visible-layers img CLIP-TO-IMAGE)))
(gimp-curves-spline layer1 0 18 (spline-chrome-it))
(set! layer-mask (car (gimp-layer-create-mask layer1 ADD-BLACK-MASK)))
(gimp-layer-add-mask layer1 layer-mask)
(gimp-selection-load mask)
(gimp-context-set-background '(255 255 255))
(gimp-edit-fill layer-mask BACKGROUND-FILL)
(set! layer2 (car (gimp-layer-copy layer1 TRUE)))
(gimp-image-add-layer img layer2 0)
(gimp-context-set-brush (brush brush-size))
(gimp-context-set-foreground '(255 255 255))
(gimp-edit-stroke layer-mask)
(gimp-context-set-background '(0 0 0))
(gimp-selection-feather img (* feather 1.5))
(gimp-selection-translate img (* 2.5 offx1) (* 2.5 offy1))
(gimp-edit-fill shadow BACKGROUND-FILL)
(gimp-selection-all img)
(gimp-context-set-pattern "Marble #1")
(gimp-edit-bucket-fill bg-layer PATTERN-BUCKET-FILL NORMAL-MODE 100 0 FALSE 0 0)
(gimp-selection-none img)
(gimp-image-convert-rgb img)
(gimp-color-balance layer1 0 TRUE (shadows (rval hc)) (shadows (gval hc)) (shadows (bval hc)))
(gimp-color-balance layer1 1 TRUE (midtones (rval hc)) (midtones (gval hc)) (midtones (bval hc)))
(gimp-color-balance layer1 2 TRUE (highlights (rval hc)) (highlights (gval hc)) (highlights (bval hc)))
(gimp-color-balance layer2 0 TRUE (shadows (rval cc)) (shadows (gval cc)) (shadows (bval cc)))
(gimp-color-balance layer2 1 TRUE (midtones (rval cc)) (midtones (gval cc)) (midtones (bval cc)))
(gimp-color-balance layer2 2 TRUE (highlights (rval cc)) (highlights (gval cc)) (highlights (bval cc)))
(gimp-hue-saturation layer2 0 0 chrome-lightness chrome-saturation)
(gimp-drawable-set-visible shadow TRUE)
(gimp-drawable-set-visible bg-layer TRUE)
(gimp-drawable-set-name layer2 "Chrome")
(gimp-drawable-set-name layer1 "Highlight")
(gimp-image-remove-channel img mask)
(gimp-display-new img)
(gimp-image-undo-enable img)
(gimp-context-pop)
)
)
(script-fu-register "script-fu-sota-chrome-it"
_"Stencil C_hrome..."
_"Add a chrome effect to the selected region (or alpha) using a specified (grayscale) stencil"
"Spencer Kimball"
"Spencer Kimball"
"1997"
"GRAY"
SF-IMAGE "Chrome image" 0
SF-DRAWABLE "Chrome mask" 0
SF-ADJUSTMENT _"Chrome saturation" '(-80 -100 100 1 10 0 0)
SF-ADJUSTMENT _"Chrome lightness" '(-47 -100 100 1 10 0 0)
SF-ADJUSTMENT _"Chrome factor" '(0.75 0 1 0.1 0.01 2 0)
SF-FILENAME _"Environment map"
(string-append gimp-data-directory
"/scripts/images/beavis.jpg")
SF-COLOR _"Highlight balance" '(211 95 0)
SF-COLOR _"Chrome balance" "black"
SF-TOGGLE _"Chrome white areas" TRUE
)
(script-fu-menu-register "script-fu-sota-chrome-it"
"<Image>/Filters/Decor")