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AutoColorize_FlavorE_6_02.scm
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; Auto colorize image into random number of colors of random hues
; author: Tin Tran
; date: 2015
(define (script-fu-auto-colorize-e image layer
hatches
)
(let*
(
(color-map 0)
(colors 0)
(image-width)
(image-height)
;(R 0.2126) ;constants for calculating luminance
;(G 0.7152)
;(B 0.0722)
;(0.299*R + 0.587*G + 0.114*B)
;(R 0.299)
;(G 0.587)
;(B 0.114)
;sqrt( 0.299*R^2 + 0.587*G^2 + 0.114*B^2 )
;(B (/ 18.0 255))
;(R (/ 54.0 255))
;(G (/ 182.0 255))
;wikipedia
(B 0.0722)
(R 0.2126)
(G 0.7152)
;how my camera sees black and white
;(B (/ 147 479))
;(R (/ 138 479))
;(G (/ 194 479))
(r) ;randomly generated r g b values
(g)
(b)
(l-original) ;luminance original
(l-new)
(red 0)
(green 0)
(blue 0)
(y 0)
(hue)
(floating)
(difference)
)
;(gimp-image-undo-disable image); DN = NO UNDO
(gimp-image-undo-group-start image) ;undo-group in one step
;convert to indexed
(set! image-width (car (gimp-image-width image)))
(set! image-height (car (gimp-image-height image)))
(gimp-image-convert-indexed image CONVERT-DITHER-NONE CONVERT-PALETTE-GENERATE hatches FALSE FALSE "unused palette name")
;grabs color map
(set! colors (vector->list (cadr (gimp-image-get-colormap image))))
(gimp-image-convert-rgb image) ;converts it to rgb before we call hatch loop
(set! y hatches) ;loop hatches number of times
(srand (car (gettimeofday)))
(gimp-context-set-sample-threshold 0)
(while (> y 0)
;do work here
(set! red (car colors))
(set! green (cadr colors))
(set! blue (caddr colors))
;select each color
(gimp-image-set-active-layer image layer)
(gimp-image-select-color image CHANNEL-OP-REPLACE layer (list red green blue))
;(set! hue (rand 360))
;(gimp-colorize layer hue 100 0)
;(gimp-edit-copy layer)
;(set! floating (car(gimp-edit-paste layer TRUE)))
;(gimp-floating-sel-to-layer floating)
;(gimp-image-set-active-layer image floating)
(set! floating (car (gimp-layer-new image image-width image-height
RGBA-IMAGE "Colorize" 100 LAYER-MODE-NORMAL))) ;creates layer
;insert above current layer
;(gimp-image-insert-layer image new-layer 0 (car (gimp-image-get-item-position image layer)))
(gimp-image-insert-layer image floating 0 0)
;set that layer to be active layer
(gimp-image-set-active-layer image floating)
(set! hue (rand 359))
(gimp-drawable-colorize-hsl floating hue 100 10)
;sqrt( 0.299*R^2 + 0.587*G^2 + 0.114*B^2 )
;(set! l-original (sqrt(+ (pow(* red R) 2) (pow (* green G) 2) (pow (* blue B) 2))))
(set! l-original (+ (* red R) (* green G) (* blue B)))
(set! difference 10)
;just randomly pick a color until we find a color of similar luminance
;absolutely not the ideal way of getting a color
(while (> difference 1)
(if (< l-original 10)
(begin
(set! r (rand 21))
(set! g (rand 21))
(set! b (rand 21))
)
(begin
(if (> l-original 245)
(begin
(set! r (+ (rand 21) 234))
(set! g (+ (rand 21) 234))
(set! b (+ (rand 21) 234))
)
(begin
(set! r (rand 254))
(set! g (rand 254))
(set! b (rand 254))
)
)
)
)
;(set! l-new (sqrt(+ (pow(* r R) 2) (pow (* g G) 2) (pow (* b B) 2))))
(set! l-new (+ (* r R) (* g G) (* b B)))
(set! difference (abs (- l-new l-original)))
)
;(script-fu-colorize image floating (list r g b) 100)
(gimp-context-set-foreground (list r g b))
(gimp-edit-fill floating FILL-FOREGROUND)
(if (> y 1) ;if y is still valid we set colors to the next colors
(begin
(set! colors (cdddr colors))
)
(begin ;else
)
)
;loop control
(set! y (- y 1))
);end of while
(gimp-selection-none image)
;(gimp-image-undo-enable image) ;DN = NO UNDO
(gimp-image-undo-group-end image) ;undo group in one step
(gimp-displays-flush)
(gc) ; garbage cleanup
)
) ;end of define
(script-fu-register
"script-fu-auto-colorize-e" ;function name
"<Image>/Script-Fu2/Create from Image/Auto Colorize Flavor E" ;menu register
"Randomly colorize image with specified number of colors. \nfile: AutoColorize_FlavorE_6_02.scm" ;description
"Tin Tran" ;author name
"copyright info and description" ;copyright info or description
"2015" ;date
"RGB*, GRAY*" ;mode
SF-IMAGE "Image" 0
SF-DRAWABLE "Layer" 0
SF-ADJUSTMENT "Number of colors" '(5 2 255 1 10 0 0)
)
; end of file