;Author: Tin Tran ; trying to reproduce a 4 color + 1 (erase every other line color) (so 5 shades in total) Obama Poster effect. (define (script-fu-erase-rows2 img drawable orientation which type) (let* ( (width (car (gimp-drawable-width drawable))) (height (car (gimp-drawable-height drawable))) (position-x (car (gimp-drawable-offsets drawable))) (position-y (cadr (gimp-drawable-offsets drawable))) ) (gimp-context-push) (gimp-context-set-feather FALSE) (gimp-image-undo-group-start img) (letrec ((loop (lambda (i max) (if (< i max) (begin (if (= orientation 0) (gimp-image-select-rectangle img CHANNEL-OP-REPLACE position-x (+ i position-y) width 1) (gimp-image-select-rectangle img CHANNEL-OP-REPLACE (+ i position-x) position-y 1 height)) (if (= type 0) (gimp-edit-clear drawable) (gimp-edit-fill drawable BACKGROUND-FILL)) (loop (+ i 2) max)))))) (loop (if (= which 0) 0 1) (if (= orientation 0) height width) ) ) (gimp-selection-none img) (gimp-image-undo-group-end img) (gimp-context-pop) (gimp-displays-flush) ) ) (define (FU2-cutout img drawable colors smoothness inMerge ) ;(gimp-image-undo-group-start img) (define indexed (car (gimp-drawable-is-indexed drawable))) (if (= indexed TRUE)(gimp-image-convert-rgb img)) (let* ( (width (car (gimp-drawable-width drawable))) (height (car (gimp-drawable-height drawable))) (old-selection (car (gimp-selection-save img))) (image-type (car (gimp-image-base-type img))) (blur (* width smoothness 0.001 )) (layer-type (car (gimp-drawable-type drawable))) (layer-temp1 (car (gimp-layer-new img width height layer-type "temp1" 100 NORMAL-MODE))) (img2 (car (gimp-image-new width height image-type))) (layer-temp2 (car (gimp-layer-new img2 width height layer-type "temp2" 100 NORMAL-MODE))) ) (if (eqv? (car (gimp-selection-is-empty img)) TRUE) (gimp-drawable-fill old-selection WHITE-IMAGE-FILL)) ; so Empty and All are the same. (gimp-selection-none img) (gimp-drawable-fill layer-temp1 TRANS-IMAGE-FILL) (gimp-image-insert-layer img layer-temp1 0 -1) (gimp-edit-copy drawable) (gimp-floating-sel-anchor (car (gimp-edit-paste layer-temp1 0))) (plug-in-gauss 1 img layer-temp1 blur blur 0) (gimp-edit-copy layer-temp1) (gimp-image-insert-layer img2 layer-temp2 0 -1) (gimp-drawable-fill layer-temp2 TRANS-IMAGE-FILL) (gimp-floating-sel-anchor (car (gimp-edit-paste layer-temp2 0))) (gimp-image-convert-indexed img2 0 0 colors 0 0 "0") (gimp-edit-copy layer-temp2) (gimp-image-delete img2) (gimp-layer-add-alpha layer-temp1) (gimp-floating-sel-anchor (car (gimp-edit-paste layer-temp1 0))) (gimp-image-select-item img CHANNEL-OP-REPLACE old-selection) (gimp-selection-invert img) (if (eqv? (car (gimp-selection-is-empty img)) FALSE) ; both Empty and All are denied (begin (gimp-edit-clear layer-temp1) )) (gimp-item-set-name layer-temp1 "Cutout") (gimp-image-select-item img CHANNEL-OP-REPLACE old-selection) (gimp-image-remove-channel img old-selection) (if (= inMerge TRUE)(gimp-image-merge-visible-layers img EXPAND-AS-NECESSARY)) ;(gimp-image-undo-group-end img) ;(gimp-displays-flush) ) ) (define (script-fu-obama-posterize image layer color1 color2 color3 color5 color4scale ) (let* ( (width (car (gimp-image-width image))) (height (car (gimp-image-height image))) (color4 '(255 255 255)) ;color4 is defined by using color3 and color5, we'll just keep un unused color like white here to change to shaded color3/5 later. ) ;(gimp-image-undo-disable image); DN = NO UNDO (gimp-context-push) (gimp-image-undo-group-start image) ;undo-group in one step (gimp-selection-none image) (gimp-item-set-name layer "Obama poster 1") (gimp-desaturate-full layer DESATURATE-LUMINOSITY) (FU2-cutout image layer 5.0 8.0 TRUE) (set! layer (car (gimp-image-get-layer-by-name image "Obama poster 1"))) (gimp-image-convert-indexed image NO-DITHER MAKE-PALETTE 5 FALSE FALSE "Custom pallette ignored") (gimp-image-set-colormap image 15 (list->vector (append color1 color2 color3 color4 color5))) (gimp-image-convert-rgb image) ;set these so that color select will only work on one color later. (gimp-context-set-antialias FALSE) (gimp-context-set-feather FALSE) (gimp-context-set-sample-merged FALSE) (gimp-context-set-sample-threshold 0) (gimp-context-set-sample-transparent TRUE) ;new layer and fill it with color3 (define new-layer-color3 (car (gimp-layer-new image width height RGBA-IMAGE "color 3 fill" 100 NORMAL-MODE))) (gimp-image-insert-layer image new-layer-color3 0 0) (gimp-context-set-foreground color3) (gimp-edit-fill new-layer-color3 FOREGROUND-FILL) ;select the color4 area and invert and cut away so we're left with color4 filled with color3 (set! layer (car (gimp-image-get-layer-by-name image "Obama poster 1"))) (gimp-image-select-color image CHANNEL-OP-REPLACE layer color4) (gimp-selection-invert image) (gimp-edit-cut new-layer-color3) ;new layer and fill it with color3 (gimp-selection-none image) (define new-layer-color5 (car (gimp-layer-new image width height RGBA-IMAGE "color 5 bars" 100 NORMAL-MODE))) (gimp-image-insert-layer image new-layer-color5 0 0) (gimp-context-set-foreground color5) (gimp-edit-fill new-layer-color5 FOREGROUND-FILL) (script-fu-erase-rows2 image new-layer-color5 0 0 0) ;scale bars to scale before cutting away. (gimp-layer-scale new-layer-color5 (* width color4scale) (* height color4scale) TRUE) (gimp-layer-resize-to-image-size new-layer-color5) ;select the color4 area and invert and cut away so we're left with color4 filled with color5's bars. (set! layer (car (gimp-image-get-layer-by-name image "Obama poster 1"))) (gimp-image-select-color image CHANNEL-OP-REPLACE layer color4) (gimp-selection-invert image) (gimp-edit-cut new-layer-color5) (gimp-selection-none image) ;(gimp-image-undo-enable image) ;DN = NO UNDO (gimp-image-undo-group-end image) ;undo group in one step (gimp-context-pop) (gimp-displays-flush) ) ) ;end of define (script-fu-register "script-fu-obama-posterize" ;function name "/Script-Fu/Artist/Obama Posterize ..." ;menu register "Obama posterize an image" ;description "Tin Tran" ;author name "copyright info and description" ;copyright info or description "2016" ;date "RGB*, GRAY*" ;mode SF-IMAGE "Image" 0 SF-DRAWABLE "Layer" 0 ;SF-GRADIENT "Gradient 1" "" ;SF-GRADIENT "Gradient 2" "" SF-COLOR "Color 1 Darkest color(Dark Blue)" '(9 0 1) SF-COLOR "Color 2 2nd Darkest color(Dark Red)" '(175 42 27) SF-COLOR "Color 3 2nd Lighest color(Light Blue)" '(101 101 101) SF-COLOR "Color 5 Lightest color(Light Gold)" '(247 228 160) SF-ADJUSTMENT "Scale of color 4 bars (color 3 and 5)" '(2 0 10 1 1 0 1) )